Very high latency over WiFi

My Arch install has been working fine for several months, but last week my network performance suddenly became extremely poor over wireless (this is a desktop with PCI wireless card installed). Wired connections still work fine. Other computers on our wireless network have not had any problems.
The problem is extremely high latency. If I ping google.com, I get numerous responses with times over 1000 ms, and often duplicates. Functionally, it causes websites to load slowly, and I often have to reload a site multiple times before it will fully load. If I'm signed into Google Chat, it will frquently report that I am disconnected, and then re-connect a few minutes later.
The primary indication of the problem is that I receive the following in errors.log:
Sep 12 11:53:21 localhost kernel: [ 776.679738] ath: Failed to stop TX DMA!
This message seems to be loosely correlated with connectivity problems, but not always. I also occasionally receive the following; it usually seems to be after the computer has gone into hibernation:
Sep 12 11:16:48 localhost kernel: [ 5584.707913] ath: Unable to reset hardware; reset status -5
Sep 12 11:16:49 localhost kernel: [ 5585.964084] ath: Unable to reset channel (2412 MHz), reset status -5
Sep 12 11:16:49 localhost kernel: [ 5585.964583] ath: Unable to set channel
Sep 12 11:16:50 localhost kernel: [ 5586.143980] ath: Unable to reset channel (2412 MHz), reset status -5
Sep 12 11:16:50 localhost kernel: [ 5586.377413] ath: Unable to reset channel (2412 MHz), reset status -5
Sep 12 11:16:50 localhost kernel: [ 5586.916044] ath: Could not kill baseband RX
When this happens, I lose all wireless connectivity until I reboot. I can't even scan for networks.
I'm using wicd and wpa_supplicant. The problem is intermittent--sometimes everything will be speedy for an hour or two, but then it will suddenly slow down.
If you have any idea what might be happening or how to diagnose it, I would appreciate it!

Similar Messages

Very high latency on my MBP 3,1 (mid 2007) with airport extreme card 0x168C

Hi
I wanted to let you know that i filled a bug report concerning a problem involving a MacBookPro3,1 and my airport extreme card (AirPort Extreme (0x168C, 0x87) Firmware Version 1.4.16.2)
If you've got any feedback, please feel free to share it with me.
Here's the bug report:
Hello
I'm experiencing very high latency on my MBP when connected using Wi-Fi in my living room and I believe this is a software bug.
This is the trace of my ping test to my router (5m from me):
macbookpro:~ laurent$ ping 192.168.0.254
PING 192.168.0.254 (192.168.0.254): 56 data bytes
64 bytes from 192.168.0.254: icmp_seq=0 ttl=64 time=1536.229 ms
64 bytes from 192.168.0.254: icmp_seq=1 ttl=64 time=536.642 ms
64 bytes from 192.168.0.254: icmp_seq=1 ttl=64 time=3444.466 ms (DUP!)
64 bytes from 192.168.0.254: icmp_seq=2 ttl=64 time=2547.260 ms
64 bytes from 192.168.0.254: icmp_seq=3 ttl=64 time=2671.552 ms
64 bytes from 192.168.0.254: icmp_seq=4 ttl=64 time=1671.272 ms
64 bytes from 192.168.0.254: icmp_seq=5 ttl=64 time=2619.991 ms
64 bytes from 192.168.0.254: icmp_seq=6 ttl=64 time=1619.350 ms
64 bytes from 192.168.0.254: icmp_seq=7 ttl=64 time=2362.474 ms
64 bytes from 192.168.0.254: icmp_seq=8 ttl=64 time=1362.662 ms
64 bytes from 192.168.0.254: icmp_seq=9 ttl=64 time=363.461 ms
64 bytes from 192.168.0.254: icmp_seq=10 ttl=64 time=1407.557 ms
64 bytes from 192.168.0.254: icmp_seq=11 ttl=64 time=1020.437 ms
64 bytes from 192.168.0.254: icmp_seq=12 ttl=64 time=119.570 ms
^C
--- 192.168.0.254 ping statistics ---
14 packets transmitted, 13 packets received, +1 duplicates, 7% packet loss
round-trip min/avg/max/stddev = 119.570/1663.066/3444.466/937.468 ms
These are the details of my network when alt clicking on the network icon:
ca:69:50:37:c7:b2
Channel: 5
RSSI: -54
Transmit Rate: 54
I'm using Channel 5 where my router is the only device available (checked with iStumbler and KissMac).
I compared these results with another computer sitting at the same place:
This is the trace of my ping test to my router using a PC laptop:
C:\Documents and Settings\Laurent>ping -t 192.168.0.254
Envoi d'une requête 'ping' sur 192.168.0.254 avec 32 octets de données :
Réponse de 192.168.0.254 : octets=32 temps=2 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=2 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=3 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=4 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=3 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=4 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=2 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=3 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=3 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=6 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=4 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=8 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=4 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=4 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=4 ms TTL=64
Réponse de 192.168.0.254 : octets=32 temps=1 ms TTL=64
Statistiques Ping pour 192.168.0.254:
Paquets : envoyés = 16, reçus = 16, perdus = 0 (perte 0%),
Durée approximative des boucles en millisecondes :
Minimum = 1ms, Maximum = 8ms, Moyenne = 3ms
(PC: Win XP SP3 with Linksys Wi-Fi card)
Obviously, my Mac has very high latency where my PC works as expected.
I tried resetting the PRAM, but i didn't affect my results.
I tried updating Airport with the latest AirPort Client Update (http://support.apple.com/downloads/AirPortClient_Update_for_MacBook_and_MacBookPro), but my hardware wasn't eligible for that update (Mid 2007 MacBookPro).
I believe this isn't a hardware bug because i get acceptable ping results when next to my router or in other rooms of my flat.
Can you help me with that bug ?
Regards,
Laurent
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP31.0070.B07
SMC Version (system): 1.16f11
Serial Number (system): W874551DX91
Hardware UUID: 00000000-0000-1000-8000-001B63B19195
Sudden Motion Sensor:
State: Enabled
AirPort:
Type: AirPort
Hardware: AirPort
BSD Device Name: en1
IPv4 Addresses: 192.168.0.2
IPv4:
Addresses: 192.168.0.2
Configuration Method: DHCP
Interface Name: en1
NetworkSignature: IPv4.Router=192.168.0.254;IPv4.RouterHardwareAddress=00:07:cb:3e:04:ef
Router: 192.168.0.254
Subnet Masks: 255.255.255.0
DNS:
Server Addresses: 212.27.40.241, 212.27.40.240
DHCP Server Responses:
Domain Name Servers: 212.27.40.241,212.27.40.240
Lease Duration (seconds): 0
DHCP Message Type: 0x05
Routers: 192.168.0.254
Server Identifier: 192.168.0.254
Subnet Mask: 255.255.255.0
Proxies:
Exceptions List: *.local, 169.254/16
FTP Passive Mode: Yes
Ethernet:
MAC Address: 00:1e:52:72:05:2c
Media Options:
Media Subtype: Auto Select
AirPort Card Information:
Wireless Card Type: AirPort Extreme (0x168C, 0x87)
Wireless Card Locale: Worldwide
Wireless Card Firmware Version: 1.4.16.2
Current Wireless Network: kalamar
Wireless Channel: 5

Ok, I must have jinxed myself.
High latency with my Negear WPN824v3. As previously mentioned, the other wireless computers connect fine. Latency remains regardless of the power connected or not.
Please advise.
PING 192.168.0.1 (192.168.0.1): 56 data bytes
64 bytes from 192.168.0.1: icmp_seq=0 ttl=64 time=11.607 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=7280.106 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=9209.019 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=8237.475 ms
64 bytes from 192.168.0.1: icmp_seq=5 ttl=64 time=7262.603 ms
64 bytes from 192.168.0.1: icmp_seq=8 ttl=64 time=4313.763 ms
64 bytes from 192.168.0.1: icmp_seq=9 ttl=64 time=3336.361 ms
64 bytes from 192.168.0.1: icmp_seq=10 ttl=64 time=2339.579 ms
64 bytes from 192.168.0.1: icmp_seq=11 ttl=64 time=1344.110 ms
64 bytes from 192.168.0.1: icmp_seq=12 ttl=64 time=345.132 ms
64 bytes from 192.168.0.1: icmp_seq=13 ttl=64 time=1191.119 ms
64 bytes from 192.168.0.1: icmp_seq=14 ttl=64 time=3969.730 ms
64 bytes from 192.168.0.1: icmp_seq=15 ttl=64 time=3992.111 ms
64 bytes from 192.168.0.1: icmp_seq=16 ttl=64 time=3692.648 ms
64 bytes from 192.168.0.1: icmp_seq=17 ttl=64 time=2927.634 ms
64 bytes from 192.168.0.1: icmp_seq=18 ttl=64 time=2130.216 ms
64 bytes from 192.168.0.1: icmp_seq=19 ttl=64 time=1437.424 ms
64 bytes from 192.168.0.1: icmp_seq=20 ttl=64 time=2385.203 ms
64 bytes from 192.168.0.1: icmp_seq=21 ttl=64 time=1393.622 ms
64 bytes from 192.168.0.1: icmp_seq=22 ttl=64 time=396.783 ms
64 bytes from 192.168.0.1: icmp_seq=23 ttl=64 time=1.295 ms
64 bytes from 192.168.0.1: icmp_seq=24 ttl=64 time=115.793 ms
64 bytes from 192.168.0.1: icmp_seq=25 ttl=64 time=3.137 ms
64 bytes from 192.168.0.1: icmp_seq=26 ttl=64 time=10.240 ms
64 bytes from 192.168.0.1: icmp_seq=27 ttl=64 time=2.709 ms
64 bytes from 192.168.0.1: icmp_seq=28 ttl=64 time=9.958 ms
64 bytes from 192.168.0.1: icmp_seq=29 ttl=64 time=1818.371 ms
64 bytes from 192.168.0.1: icmp_seq=30 ttl=64 time=1470.613 ms
64 bytes from 192.168.0.1: icmp_seq=31 ttl=64 time=472.520 ms
64 bytes from 192.168.0.1: icmp_seq=32 ttl=64 time=2255.417 ms
64 bytes from 192.168.0.1: icmp_seq=33 ttl=64 time=18198.039 ms
64 bytes from 192.168.0.1: icmp_seq=34 ttl=64 time=23288.761 ms
64 bytes from 192.168.0.1: icmp_seq=35 ttl=64 time=25150.840 ms
64 bytes from 192.168.0.1: icmp_seq=36 ttl=64 time=26813.832 ms
^C
--- 192.168.0.1 ping statistics ---
63 packets transmitted, 34 packets received, 46% packet loss
round-trip min/avg/max/stddev = 1.295/4906.111/26813.832/7241.136 ms

Very high Latency and inconsistent download speeds

Hi all,
This is my first time on these forums and hopefully i can find some help for my horrible problem.
For the last 2-3 weeks my latency has consistently been 200+, i like to play online games alot and i cant with this latency. I have gone threw the whole drill of ringing BT and following there advice and i even had a BT engineer come out and he couldnt' find any problems. BT said they checked my line and couldn't find anything wrong, and the engineer didn't find any problems with the router (black).
I also have changed all of the wiring from the socket in the wall, which leads to the router, which leaders to a modem (i think its called that) that then connects me to the internet (Cable).
I am running out of patience as i spend alot of time on games such as Call of Duty and seeing my mates play it as i have 300+ ping is really annoying.
I Have noticed that the other computer my parents use also have the same high latency issue and they have tried it on cable and wireless with the same bad results. I have a program called xfire which shows my ping for all the servers on my list and there all 200+ but sometimes when i test my speeds on speedtest.net it shows me with 50 ping i believe this is due to the large spikes that i get, when im on call of duty it constantly jumps around 100, 150, 200 and sometimes even 50.
Any advice would be greatly appreciated.
Josh.
Also im not very good with computers so if anyone would like any figures or whatever just point me to the website and ill try and get them for you.
http://www.speedtest.net/result/1133172089.png
This looks ok but on xfire all the servers are at 300+ and when i go ingame there just as high.

Test1 comprises of Best Effort Test: -provides background information.
Download Speed
2550 Kbps
0 Kbps
7150 Kbps
Max Achievable Speed
Download speedachieved during the test was - 2550 Kbps
For your connection, the acceptable range of speeds is 600-7150 Kbps.
Additional Information:
Your DSL Connection Rate :3680 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
IP Profile for your line is - 3000 Kbps

Very high latency in fetching static files

Problem : Really high latency in fetching static files upon first request.
Environment : Weblogic V8.1 App Server and Web Server running using jdk1.4.2_13
Mem Setting: -Xmx2048M -XX:MaxPermSize=1024M
Situaton: Restart the weblogic server, fetch a static file using " wget hostname:port/script.js". Comes back in around 100 ms for us. Then from browser we request "http://hostname:portname/Logon.do". Then again we do " wget hostname:port/script.js" and now it comes back in 400 ms. The above times are in our TEST environment. In PROD it is really worse 1300ms for one file !!!
Tests:
Wrote a servlet to handle all static file (CSS,js,gif,jpeg etc) and all requests would go through this servlet. Did not solve the problem, latency is still high.
Wrote a test servlet to load about 1000 classes explicitly (Class.forName) and then fetched the static file with out accessing Logon.do from browser. Latency was high after loading classes. This lead to conclusion that it is number of classes we are loading which is causing the problem.
Ran application under JProfiler, Took a heap dump right after starting server. About 1300 classes loaded. Took a heap dump after fetching Logon.do. About 2100 classes loaded.
Question :
1) Isn't 1300 too high for just the server to start? (there are some classes loaded because of our references in ejb's)
2) We use prototype factory to instantiate classes. All the interface and implementation definitions are specified in config file and it seems to load all the classes. May be we can change this. But what confuses me is that the response time was okay when we had 1300 classes loaded how come it became so bad when there were 2100 classes ?
If any body is using these same set of technologies, what is the average number of classes loaded on initial start up?
I am running out of options to test?

There's no way from what you posted that you could draw a conclusion that you are infected.
I totally missed that tracert, but from a ping response time, it looks healthy.
The packet loss, could easily cause your problem.
Does it consistently loose packets there ? Cause I've pinged it from here and got no loss.
Also remember that in this case, ping is also the time it takes the blizzard servers to response to your network message, so it could be local to blizzard, and ping might not detect that.
Have you tried a netstat -p tcp -b command too see whats active on your PC ? That could point you towards something local.

Updating to 10.6.7 Destroy's WiFi...(Very High Latency)

Updating to 10.6.7 seems to have made my wireless connections useless. everything was fine at 10.6.6... After upgrading to 10.6.7 I noticed terrible latency and lag while playing an online game. I looked at the server list for the game and did a refresh, all the servers normally listing 30-90ms were now in the hundreds. 500ms...800ms...etc... I thought it was nothing.. tried basic troubleshooting steps and determined that it wasn't just the online game. I started looking at the connection.
Ping reply's online were returning very bad response times.. so I said OK, I'll ping the gateway here and see.. cause that I know I should be getting <1ms or slightly higher... it was also extremely high.. 345...800...750 etc....
After some more basic troubleshooting I determined that it had to be the recently installed OS update... finding no solution to the issue online I decided to do a backup and reinstall OS X.
I did a fresh install of OS X the network was back to normal... I downloaded 10.6.7 combo update and installed it... wireless was destroyed again...it has to be the update....
I did yet another fresh install of OS X.. this time I installed the 10.6.6 combo update and all the other software updates except for 10.6.7... the wireless is perfectly fine!
I am left with the only conclusion that the 10.6.7 update destroy's wifi from a latency standpoint.. making it useless to me for the most part.. even for basic surfing... I had no issues with connecting to the wireless.. just that it was basically useless after 10.6.7. I am on an iMac 24" Intel Core2 Duo model.
Anyone else having this issue or know a solution? For now I will just be leaving 10.6.7 alone.

Welcome to Apple Discussions!
10.6.7 does nothing to my WiFi latency. My suggestion is to check if your router's firmware is up to date, and known to be 10.6.7 compatible. Just because it is 10.6 to 10.6.6 compatible does not mean it is 10.6.7 compatible. I have Apple's airport extreme base station with 802.11n. Check also if you are proxies, or have certain firewall ports enabled on the System Preferences -> Security & Sharing that might interfere with the router's own firewall ports. If you have stated DNS numbers in Apple menu -> System preferences -> Network, make sure they are also stated on the router's own setup page, or remove DNS numbers from both, as those can contribute to latency under certain conditions. I have an iMac 5,1 and my WiFi is doing great, even when running a VPN over VirtualBox with Windows XP. Double check the games in question have been tested with 10.6.7. They may have their own configuration issues. If the game uses Flash, make sure the version of Adobe Flash you are using has been tested with 10.6.7 by contacting Adobe.

Very slow printing over WiFi

Hi everyone!
One of my clients has uses a 4th generation Apple AirPort Extreme. It's a small network with only 3 to 5 users.
All users connect via Ethernet cable, but one individual recently moved her iMac 21 to a spot in the office that doesn't have a wired network connection. Although she's able to work fine via a wireless connection in almost every respect, printing to their Canon ir C3080 copier is painfully slow over wireless. It doesn't matter what she tries to print - even a small text file takes up to five minutes to print. When I move and connect her iMac to the network via Ethernet, the printing problem disappears.
I then tested the other computers in the office and my computer for this problem and found that they all printed very slowly over the WiFi connection.
Their AirPort base station is up-to-date with the most current firmware, and all the computers are running the most updated versions of Snow Leopard. I'm running Lion on my computer, by the way.
Does anyone have any idea what might be causing this problem? I don't have another printer I can test in this office, but I think that may be the next thing I have to do.
Any advice/suggestions would be greatly appreciated!
Thanks in advance!

iMac (27-inch Mid 2011), OS X Mavericks (10.9.4), SL & ML, G4 450 MP w/Leopard, 9.2.2

Email sending over 3g very fast sending over wifi deadly slow

hi all.
forum = last resort for me.
brand new 3gs on vodafone aus 3g network. sending email is very fats. when it switches to wireless at work or at home sending email can take up to 10 minutes.
any idea whats up with that? anyone else have the same problem? any help is much appreciated. thanks

Most ISPs offer a very fast download rate (what you see when viewing a site) but a very slow upload rate. It's entirely possible that your upload rate through your WiFi connection is slower than the upload rate available via your cellular network.

Random Very High Latency 3 Seconds

My Broadband was faultless for years but was faulty a while ago around April this year and this was repaired (it was tree damage to an overhead line and took about a full month for Openreach to fix)). But it has never really been great since this fix (I was never able to put my finger on what was wrong) and took a while for me to trace, there appear to be long delays for requests when browsing the t'interweb. I found the delays using both ping and traceroute results. It seems the first hop from my router to 217.32.142.194 which is part of BT infrastructure I think, this can have delays of over 3 seconds, but this can vary from tens of mS (normal operation) to thousands of mS (not working at all). It occurs at random , different times of day or night and you can tell when it's happening while browsing, your request just takes ages to appear. I have tried ethernet connected computers to my router so it isn't a wireless induced delay. I have tried different DNS servers from BT's own, OpenDNS and Google Public DNS with no change to the random delays. I have also used tcpdump and port 53 filter to see if it was DNS request delays but this doesn't seem to be the problem. Is there something wrong with BT's core network?
I am going to write a shell script to test these delays every half hour to see if a pattern emerges.
Some traceroute results within 5 minutes of each other.
Really not working at all
traceroute to google.co.uk (173.194.66.94), 30 hops max, 60 byte packets
1 192.168.1.1 (192.168.1.1) 1.120 ms 0.792 ms 0.953 ms
2 217.32.142.194 (217.32.142.194) 3216.656 ms 3217.232 ms 3217.648 ms
3 217.32.142.238 (217.32.142.238) 3218.504 ms 3219.896 ms 3220.090 ms
4 212.140.206.210 (212.140.206.210) 3227.908 ms 3227.711 ms 3228.309 ms
5 31.55.165.93 (31.55.165.93) 3230.906 ms 3231.504 ms 3231.703 ms
6 31.55.165.107 (31.55.165.107) 3232.700 ms 2652.743 ms 2653.236 ms
Not too Working Well
traceroute to google.co.uk (173.194.66.94), 30 hops max, 60 byte packets
1 192.168.1.1 (192.168.1.1) 0.763 ms 0.857 ms 0.641 ms
2 217.32.142.194 (217.32.142.194) 1845.907 ms 1846.030 ms 1846.220 ms
3 217.32.142.238 (217.32.142.238) 1848.416 ms 1849.019 ms 1849.608 ms
Working Fine
traceroute to google.co.uk (173.194.66.94), 30 hops max, 60 byte packets
1 192.168.1.1 (192.168.1.1) 1.141 ms 0.822 ms 0.975 ms
2 217.32.142.194 (217.32.142.194) 23.948 ms 23.751 ms 24.947 ms
3 217.32.142.238 (217.32.142.238) 26.607 ms 28.005 ms 27.800 ms
4 212.140.206.210 (212.140.206.210) 34.780 ms 35.387 ms 35.985 ms
5 31.55.165.93 (31.55.165.93) 38.175 ms 38.784 ms 39.782 ms
Line Rate - Upstream (Kbps)
1031
Line Rate - Downstream (Kbps)
7763
Default Gateway / IPv4 Address
pppoa0 (DSL) / 31.53.231.224
Connection Time
00:51:42
Primary DNS Server
217.32.171.22
Secondary DNS Server
213.120.234.50
Any advice welcome.

Broadband is working fine as I type this but it usually doesn't last.
Stats from my Billion 7800DXL
> adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime Last Retrain
Reason: 8000 Last initialization procedure status: 0
Max: Upstream rate = 1064 Kbps, Downstream rate = 8972 Kbps
Bearer: 0, Upstream rate = 1056 Kbps, Downstream rate = 7752 Kbps
Link Power State: L0
Mode: ADSL2+
TPS-TC: ATM Mode
Trellis: UN /DN Line
Status: No Defect
Training Status: Showtime
              Down       Up
SNR (dB): 5.3          5.9
Attn(dB): 43.5         22.3
Pwr(dBm): 0.0         12.7

High latency ping to local router on wifi

I'm running 10.10.3 on a MacBook Air mid 2012 and have started to experience very high latency when using WiFi. I've gone through some of the internets and deleted a few files out of /Library/Preferences/SystemConfiguration/ but that didn't do anything. A few other searches yield similar stories but nothing suggested fixed it. For the life of me I can't figure this one out.
Doesn't matter what WiFi network I am using
Hardwired works great
Here's a sample of what I am seeing. Packet loss being 0% is only on the LAN.. as soon as I ping something on the WAN I'm getting a few percentage dropped packets.
$ sudo ping -i .1 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
--- 192.168.1.1 ping statistics ---
76 packets transmitted, 76 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 1.372/244.464/1391.556/372.973 ms

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
There are multiple possible reasons. Hosts aren't required to treat pings with utmost priority, so some of the variability could be just how busy the host is or there could also be congestion along the path, to name two possible issues.
Again, "basic" ping is really more to determine a host is "alive", not for highly accurate latency measurements. However, if you enable IP timestamp, you might get more accurate RTT latency (you may need to calculate the deltas, yourself).

High Latency

Hi, when trying to connect to my work VPN from my girfriends house the connection is unusable, speaking to the girlfriend she is regulally thrown off her VPN connection whilst working from home. After a few traceroutes I noticed very high latency on the route between the home hub and VPN gateway:
Traceroute:
traceroute to ukc1-twvpn.oraclevpn.com (144.24.19.20), 60 hops max, 60 byte packets
1 BThomehub.home (192.168.1.254) 17.482 ms 17.154 ms 17.062 ms
2 217.32.142.201 (217.32.142.201) 22.871 ms 25.683 ms 25.596 ms
3 217.32.147.174 (217.32.147.174) 25.350 ms 25.930 ms 26.414 ms
4 212.140.206.90 (212.140.206.90) 30.361 ms 31.576 ms 32.324 ms
5 217.41.169.215 (217.41.169.215) 32.262 ms 32.884 ms 33.496 ms
6 217.41.169.109 (217.41.169.109) 34.581 ms 20.622 ms 21.236 ms
7 acc2-xe-2-0-3.sf.21cn-ipp.bt.net (109.159.255.223) 21.177 ms acc2-xe-0-2-1.sf.21cn-ipp.bt.net (109.159.251.213) 321.036 ms acc2-xe-0-3-1.sf.21cn-ipp.bt.net (109.159.251.237) 321.884 ms
8 core1-te0-4-0-2.ilford.ukcore.bt.net (109.159.251.129) 322.600 ms core1-te-0-13-0-12.ealing.ukcore.bt.net (109.159.251.169) 324.078 ms core2-te0-0-0-6.ealing.ukcore.bt.net (109.159.251.159) 325.564 ms
9 peer2-xe1-0-0.telehouse.ukcore.bt.net (109.159.254.104) 323.088 ms 194.72.31.159 (194.72.31.159) 324.616 ms 326.111 ms
10 t2c3-xe-2-1-2-0.uk-lon1.eu.bt.net (166.49.211.192) 329.071 ms t2c3-xe-0-1-1-0.uk-lon1.eu.bt.net (166.49.211.164) 329.642 ms t2c3-xe-1-1-3-0.uk-lon1.eu.bt.net (166.49.211.182) 327.789 ms
11 166-49-211-254.eu.bt.net (166.49.211.254) 326.511 ms 328.270 ms 67.958 ms
12 ae14-xcr1.lnd.cw.net (195.2.30.113) 68.455 ms 69.132 ms 105.162 ms
13 ae0-xcr2.lnd.cw.net (195.2.25.122) 103.959 ms 102.668 ms 101.729 ms
14 ae10-xcr1.bkl.cw.net (195.2.30.166) 105.256 ms 106.756 ms 105.887 ms
15 oracle-gw-bkl.cw.net (195.59.8.10) 109.243 ms 107.291 ms 108.281 ms
16 144.24.17.2 (144.24.17.2) 110.882 ms 111.875 ms 109.591 ms
17 * * *
18 * * *
19 * * *
Who can I get in touch with to help troubleshoot this issue? I have gone through all normal basic troubleshooting steps such as the ubiqutous reboots of all technology. Many thanks.
Chris.

Is that problem consistent? My ping/tracert is fine: also from Infinity connection. I can't check the VPN itself.
I see your route and mine are both pretty similar and indeed both go through 212.140.206.90
You seem to have very high pings even to the HomeHub. Normally that should show up as 1ms or less even with wireless.
Tracing route to ukc1-twvpn.oraclevpn.com [144.24.19.20]
over a maximum of 30 hops:
1 1 ms <1 ms <1 ms 192.168.1.254
2 6 ms 5 ms 5 ms 172.16.14.14
3 * * * Request timed out.
4 8 ms 8 ms 7 ms 213.120.158.173
5 13 ms 12 ms 12 ms 212.140.206.90
6 12 ms 11 ms 11 ms 217.41.169.219
7 12 ms 11 ms 11 ms 217.41.169.109
8 13 ms 30 ms 12 ms acc2-xe-1-3-0.sf.21cn-ipp.bt.net [109.159.251.203]
9 21 ms 23 ms 23 ms core2-te-0-13-0-10.ealing.ukcore.bt.net [109.159.251.179]
10 20 ms 20 ms 20 ms peer2-xe3-3-1.telehouse.ukcore.bt.net [109.159.254.227]
11 20 ms 20 ms 20 ms t2c3-xe-0-1-2-0.uk-lon1.eu.bt.net [166.49.211.166]
12 22 ms 22 ms 22 ms 166-49-211-254.eu.bt.net [166.49.211.254]
13 24 ms 24 ms 23 ms ae14-xcr1.lnd.cw.net [195.2.30.113]
14 19 ms 19 ms 19 ms ae0-xcr2.lnd.cw.net [195.2.25.122]
15 20 ms 17 ms 18 ms ae10-xcr1.bkl.cw.net [195.2.30.166]
16 24 ms 23 ms 22 ms oracle-gw-bkl.cw.net [195.59.8.10]
17 21 ms 21 ms 20 ms 144.24.17.2
18 20 ms 20 ms 20 ms ukc1-twvpn.oraclevpn.com [144.24.19.20]

Why does my 10GB iSCSI setup seem see such high latency and how can I fix it?

I have a iscsi server setup with the following configuration
Dell R510
Perc H700 Raid controller
Windows Server 2012 R2
Intel Ethernet X520 10Gb
12 near line SAS drives
I have tried both Starwind and the built in Server 2012 iscsi software but see similar results. I am currently running the latest version of starwinds free
iscsi server.
I have connected it to a HP 8212 10Gb port which is also connected via 10Gb to our vmware servers. I have a dedicated vlan just for iscsi and have enabled
jumbo frames on the vlan.
I frequently see very high latency on my iscsi storage. So much so that it can timeout or hang vmware. I am not sure why. I can run IOmeter and
get some pretty decent results.
I am trying to determine why I see such high latency 100'ms. It doesn't seem to always happen, but several times throughout the day, vmware is complaining
about the latency of the datastore. I have a 10Gb iscsi connection between the servers. I wouldn't expect the disks to be able to max that out. The highest I could see when running IO meter was around 5Gb. I also don't see much load
at all on the iscsi server when I see the high latency. It seems network related, but I am not sure what settings I could check. The 10Gb connect should be plenty as I said and it is no where near maxing that out.
Any thoughts about any configuration changes I could make to my vmware enviroment, network card settings or any ideas on where I can troubleshoot this. I
am not able to find what is causing it. I reference this document and for changes to my iscsi settings
http://en.community.dell.com/techcenter/extras/m/white_papers/20403565.aspx
Thank you for your time.

I have a iscsi server setup with the following configuration
Dell R510
Perc H700 Raid controller
Windows Server 2012 R2
Intel Ethernet X520 10Gb
12 near line SAS drives
I have tried both Starwind and the built in Server 2012 iscsi software but see similar results. I am currently running the latest version of starwinds free
iscsi server.
I have connected it to a HP 8212 10Gb port which is also connected via 10Gb to our vmware servers. I have a dedicated vlan just for iscsi and have enabled
jumbo frames on the vlan.
I frequently see very high latency on my iscsi storage. So much so that it can timeout or hang vmware. I am not sure why. I can run IOmeter and
get some pretty decent results.
I am trying to determine why I see such high latency 100'ms. It doesn't seem to always happen, but several times throughout the day, vmware is complaining
about the latency of the datastore. I have a 10Gb iscsi connection between the servers. I wouldn't expect the disks to be able to max that out. The highest I could see when running IO meter was around 5Gb. I also don't see much load
at all on the iscsi server when I see the high latency. It seems network related, but I am not sure what settings I could check. The 10Gb connect should be plenty as I said and it is no where near maxing that out.
Any thoughts about any configuration changes I could make to my vmware enviroment, network card settings or any ideas on where I can troubleshoot this. I
am not able to find what is causing it. I reference this document and for changes to my iscsi settings
http://en.community.dell.com/techcenter/extras/m/white_papers/20403565.aspx
Thank you for your time.
If both StarWind and MSFT target show the same numbers I can guess it's network configuration issue. Anything higher then 30 ms is a nightmare :( Did you properly tune your network stacks? What numbers (x-put and latency) you get for raw TCP numbers (NTtcp
and Iperf are handy to show)?
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

WLC 4402 upgrade to 7.0.235.3 -- high latency

Hi All,
Since we've upgraded the 4402 (from 4-2-176-0) to 7.0.235.3 many client facing very high latency.
We're having 12 x 1142 APs and they are connected in local mode to WLC.
Before the upgrade performance was good. Now, when I ping from LAN to WLAN clients it takes from 0.1ms - 20s.
64 bytes from 10.123.60.210: icmp_seq=58 ttl=127 time=4711 ms
64 bytes from 10.123.60.210: icmp_seq=59 ttl=127 time=3711 ms
64 bytes from 10.123.60.210: icmp_seq=60 ttl=127 time=2712 ms
64 bytes from 10.123.60.210: icmp_seq=61 ttl=127 time=1713 ms
64 bytes from 10.123.60.210: icmp_seq=62 ttl=127 time=754 ms
64 bytes from 10.123.60.210: icmp_seq=63 ttl=127 time=3.12 ms
64 bytes from 10.123.60.210: icmp_seq=64 ttl=127 time=1109 ms
64 bytes from 10.123.60.210: icmp_seq=65 ttl=127 time=109 ms
64 bytes from 10.123.60.210: icmp_seq=66 ttl=127 time=0.949 ms
I cant find any pattern..seems to happen to random clienst at radom time.
Any ideas..or further checks I can do?
Thanks a lot,
Stefan

All is set to auto.

High Latency Issue

Hi,
So for the past 2 or so days I have had issues with very high latency. I have been getting a pretty much constant 300ms spiking commonly to about 400-500ms. Normally I am experiencing 31-60ms so this is a huge spike out of nowhere, I am pretty positive it is nothing inside of the house as we have not connected any new devices or moved the BT Hub 4 at all.
I have seen some users talking about something called Fast Path, although I do not know what this is if it helps resolve my latency issue then would it be possible to put me onto this.
Thank you in advance.

Here,
1. Product name:
BT Home Hub
2. Serial number:
+076270+NQ43132190
3. Firmware version:
Software version 4.7.5.1.83.8.130.1.17 (Type A) Last updated 31/10/14
4. Board version:
BT Hub 4A
5. ADSL uptime:
0 days, 01:19:41
6. Bandwidth:
448 / 4384
7. Data sent/received:
231.9 MB / 364.0 MB
8. Broadband username:
[email protected]
9. BT FON:
Yes
10. 2.4 GHz Wireless network/SSID:
BTHub4-FT6W
11. 2.4 GHz Wireless connections:
Enabled (802.11 b/g/n (Recommended)) 20 MHz, WPS enabled
12. 2.4 GHz Wireless security:
WPA and WPA2
13. 2.4 GHz Wireless channel:
Automatic / 6
14. 5 GHz Wireless network/SSID:
BTHub4-FT6W
15. 5 GHz Wireless connections:
Enabled (802.11 n 40 MHz (Recommended)) 20/40 MHz, WPS enabled
16. 5 GHz Wireless security:
WPA2
17. 5 GHz Wireless channel:
Automatic / 40
18. Firewall:
Default
19. MAC Address:
c8:91:f9:49:4b:ba
20. VPI/VCI:
0 / 38
21. Modulation:
G.992.1 Annex A
22. Latency type:
Interleaved
23. Software variant:
24. Boot loader:

IPhone 4 OS 7.1.2 (11D257) display normal when switching on, turns to very high contrast primary colours only, no tonal graduation. Wifi no longer works.

iPhone 4 OS 7.1.2 (11D257) display normal when switching on, turns to very high contrast with bright primary colours only, no tonal graduation.Initially problem arose every time I switched the Camera on, but has worsened such that any application can cause it. In Camera, after a short time screen goes black. Also, Wifi no longer works.

You're welcome
In case you don't want to buy a new iPhone, Apple will replace the whole unit if you are willing to pay the service fee of 149$ for the iPhone4.
Out-of-warranty repair service
If your repair isn’t covered by Apple’s One Year Limited Warranty, AppleCare+, or AppleCare Protection Plan, your iPhone might be eligible for out-of-warranty service. For example, liquid damage isn’t covered by warranty but might be eligible for out-of-warranty service. Some damage isn’t eligible at all, for example if your device has been broken into multiple pieces. See Apple’s Repair Terms and Conditions for complete details.
Read Apple’s Repair Terms and Conditions
Model
Out-of-warranty service fee
Battery service*
iPhone 6 Plus
$329
$79
*available only if battery
fails Apple’s diagnostic test
iPhone 6
$299
iPhone 5s, iPhone 5c, iPhone 5
$269
iPhone 4s
$199
iPhone 4, iPhone 3GS, iPhone 3G,
Original iPhone
$149
Plus a $6.95 shipping fee, if required. Fees are in USD and exclude local tax. Pricing is for service through Apple. The final service fee we charge will be determined during testing and may be less than the service fee listed above. Pricing and terms vary for service through an Apple Authorized Service Provider.
copied from Service Answer Center - iPhone

Lumia 920 Facebook connection very slow over WiFi ...

Since the Portico update the connection to Facebook both in the People and Me hub as well as in the Facebook app is very slow over WiFi, whilst still good over 4G/LTE (with WiFi off). The connection to the Nokia account also appears to have a similar problem. All other accounts and apps have good speed over both cellular and WiFi connections.
Any ideas anybody?
PS: FYI, a bit more info about the history and context: When I noticed the problem the first time after the update, I tried to solve it by deleting and re-adding my Facebook account on the phone. Unfortunately, that made me lose my Me hub tile, so I decided to do a full reset. That again unfortunately got stuck on the togg wheels, so I restored the phone using Nokia Care Suite with the latest firmware, and restored my accounts, apps and settings from scratch. Everythings seems to work fine now, except the above mentioned Facebook and Nokia account connectivity problem.

Did you somehow solve this problem?
I have the same issue here with my Lumia 920.
However I have already found out that it only applies to my home Wifi. All other Wifi networks i was connecting to did work flawlesly.
I need to note that all other devices on my home network are using facebook without a glitch. Only Lumia has some problems with it.

Very high latency over WiFi

Similar Messages

Maybe you are looking for