Ath9k slow an unreliable; carl9170 randomly stalls

I've been trying (unsuccessfully) for months to get reliable wireless on a desktop. I have tried three different cards, each with different chipsets.
The one I would like to get working most is the D-Link DWA-556, which is based on the ath9k chipset AR5416+AR2133. (http://www.dlink.com/products/?pid=549) I specifically bought this card after looking online for what seemed to be the most compatible wireless N card for Linux after having problems with my previous cards. Everything seemed to point to the drivers being of decent quality and having it work without too much effort. Boy, was that wrong.
Most of the time it will fail to grab the address from DHCP. Sometimes it will connect successfully, but it is incredibly slow. Running online broadband speed tests will typically show speeds of around 0.5 Mbps, and local file transfers are around 500 KBps.
Looking online, I saw this kernel bug (https://bugzilla.kernel.org/show_bug.cgi?id=31452), but the fix was committed in 2.6.38.5 and I am currently on 2.6.38.6. There were other posts online recommending disabling hardware encryption with the ath9k module option "nohwcrypt=1", but that didn't seem to fix it. In fact, after disabling hardware encryption it seemed to make it more likely for DHCP to time out, and that persisted even after re-enabling hardware encryption and even rebooting. I also tried to install compat-wireless-patched and compat-wireless-patched-daily from AUR to no effect. (normal compat-wireless fails to compile...)
Here are the messages in everything.log when it fails to connect:
May 14 13:55:40 localhost kernel: [ 981.483682] ADDRCONF(NETDEV_UP): wlan0: link is not ready
May 14 13:55:43 localhost kernel: [ 984.405389] wlan0: authenticate with 00:18:e7:ef:ea:9e (try 1)
May 14 13:55:43 localhost kernel: [ 984.411455] wlan0: authenticated
May 14 13:55:43 localhost kernel: [ 984.411475] wlan0: associate with 00:18:e7:ef:ea:9e (try 1)
May 14 13:55:43 localhost kernel: [ 984.609945] wlan0: associate with 00:18:e7:ef:ea:9e (try 2)
May 14 13:55:43 localhost kernel: [ 984.622492] wlan0: RX AssocResp from 00:18:e7:ef:ea:9e (capab=0x431 status=0 aid=1)
May 14 13:55:43 localhost kernel: [ 984.622494] wlan0: associated
May 14 13:55:43 localhost kernel: [ 984.624830] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
May 14 13:55:45 localhost avahi-daemon[1786]: Registering new address record for fe80::5ed9:98ff:feb1:39fe on wlan0.*.
May 14 13:55:49 localhost dhcpcd[1873]: version 5.2.12 starting
May 14 13:55:49 localhost dhcpcd[1873]: wlan0: rebinding lease of 192.168.0.104
May 14 13:55:54 localhost kernel: [ 995.056604] wlan0: no IPv6 routers present
May 14 13:55:59 localhost dhcpcd[1873]: timed out
May 14 13:55:59 localhost avahi-daemon[1786]: Withdrawing address record for fe80::5ed9:98ff:feb1:39fe on wlan0.
May 14 13:55:59 localhost kernel: [ 1000.574481] wlan0: deauthenticating from 00:18:e7:ef:ea:9e by local choice (reason=3)
May 14 13:55:59 localhost kernel: [ 1000.605166] cfg80211: Calling CRDA to update world regulatory domain
May 14 13:55:59 localhost kernel: [ 1000.605502] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
My fallback is what I was using before, which is a USB wireless N dongle based on the ar9170 chipset. (http://www.iogear.com/product/GWU623/) It mostly works alright, if a little slow for my tastes for local file transfers, (around 2.5 MBps) but the big problem is the network will sometimes stall for a couple minutes. There don't appear to be any messages in the logs when this happens, and iwconfig and ifconfig still say that it's connected, but any attempts to access the network fail until it comes back in a couple minutes.
Any help would be greatly appreciated. To say this has been frustrating is a great understatement.
Last edited by akb825 (2011-05-15 09:08:38)

A little more information: Here's the output for iwconfig
wlan0 IEEE 802.11bgn ESSID:"d20"
Mode:Managed Frequency:2.417 GHz Access Point: 00:18:E7:EF:EA:9E
Bit Rate=104 Mb/s Tx-Power=19 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=40/70 Signal level=-70 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:64 Missed beacon:0
Despite this decent looking output for bit rate and signal, scp is currently transferring at around 60 KB/s. However, the "Invalid misc" part seems to be increasing at a fast rate when transferring data. (after around a minute of letting scp run, it had an additional 100 "Invalid misc") This seems to be similar to the kernel bug that I linked to, but it happens regardless of hardware encryption and the version of the kernel I am running already has the fix, though it's possible it's a separate bug related bug.

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Kevin Stauss

Hello, Kevin,
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.
See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...
http://support.apple.com/kb/PH7029
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
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Evening, mornin' all,
this is the first post from a somewhat frustrated switcher.
Didn´t know in what forum to post. Since the problem arises in most applications I figures this is the right place.
My 2 month old mac mini´s OS is acting weird.
I first noticed it when Itunes stuttered. And I mean heavy stuttering. Every 4 seconds a 1 second stall, in every song. On PC speakers as well as through airport. CD´s are self imported. BTW, radio stream does not stutter!
After that, I noticed that i.e. when clicking on the apple menu, it took a second or two before it to come active (beach ball playing up)
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Used the disk utility program as well.
Monitor log only shows the hangups in safari. Not in other apps, although it happens there as well.
Wanting to use the mini as a media center, this hickup renders it useless to me.
By bying a mac, I wanted to get rid of the windoze hassles with various disk preformance control programs around, registry cleaners and what have you not.
FWIW, Besides office for mac (sorry folks, it´s for the wife) I have no other programs installed. No movies either (I have the thing barely for 2 months)
Anyone having the same experience?
appologies for the lengthy post!
cheers

Well I'm back and so is the problem. It seems that the new harddrive did not solve anything at all.
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cheers,

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What factors can I look in to to cause the entire operating system to slow down dramatically? I can't recall if there was any single instance that started this behavior but it's been several weeks now.
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Not bad at all. I ran *sudo chmod -RN "/System/Library/User Template"* and it significantly reduced all the messages I received in disk utility. We went from about 40 to 8. The remaining messages are below.
2009-01-30 20:00:01 -0500: Warning: SUID file "System/Library/Filesystems/AppleShare/afpLoad" has been modified and will not be repaired.
2009-01-30 20:00:01 -0500: Warning: SUID file "usr/bin/setregion" has been modified and will not be repaired.
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2009-01-30 20:00:09 -0500: Warning: SUID file "System/Library/Printers/IOMs/LPRIOM.plugin/Contents/MacOS/LPRIOMHelper" has been modified and will not be repaired.
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2009-01-30 20:00:13 -0500: ACL missing on "System/Library/User Template/English.lproj/Documents".
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My MacBook pro is slow and keeps on randomly shutting down.

I got it in 2011 and its updated. I recently have been using my computer a lot for work and school and as soon as I go on certain apps and sites (ex. Mail, Word, Gmail, Preveiw, ect.) it gets extremly slow and the circle loading sign comes up for a long time. Then it blacks; it doesnt shut down or sleep, but the screen just goes blank. I don't know if it has anything to do with my batery, or some sort of MAC virus, but its driving me crazy. I am not sure what to do.. any ideas?
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Back up your documents and everything else important to you. The symptoms you describe may presage an impending disk failure, and you should have backups anyway.
If you suspect the hard disk may be failing, try repairing it with Disk Utility:
Boot OS X Recovery by holding ⌘ and r (two fingers) while you start your Mac. At the Mac OS X Utilities screen, select Disk Utility. Select your startup volume (usually named "Macintosh HD") and click the Repair Disk button. Describe any errors it reports in red.
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When Disk Utility finishes, restart your Mac and test again for operation.
If problems continues to occur please determine if they also occur in "Safe Mode":
Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components. Read about it: Starting up in Safe Mode
Starting your Mac in Safe Mode will take longer than usual, graphics will not render smoothly, audio is disabled on some Macs, some networking functions are disabled, and some programs (iTunes for example) may not work at all.
To end Safe Mode restart your Mac normally. Shutdown will take longer as well.
Reply with the results of the above.

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I'd rather use IE than this FF.

You can make your Firefox fast again. Try out these steps
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Run Disk Warrior instead, don't trust Apple First Aid, it doesn't do a thorough job.
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DSL Connection
Link Information
Uptime:   0 days, 0:29:27
Modulation:   G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]:   448 / 768
Data Transferred (Sent/Received) [MB/MB]:   19.28 / 20.58
Output Power (Up/Down) [dBm]:   12.5 / 13.5
Line Attenuation (Up/Down) [dB]:   27.5 / 47.0
SN Margin (Up/Down) [dB]:   23.0 / 13.5
Vendor ID (Local/Remote):   TMMB / IFTN
Loss of Framing (Local/Remote):   0 / 0
Loss of Signal (Local/Remote):   0 / 0
Loss of Power (Local/Remote):   0 / 0
Loss of Link (Remote):   0
Error Seconds (Local/Remote):   0 / 0
FEC Errors (Up/Down):   0 / 1,216
CRC Errors (Up/Down):   0 / 0
HEC Errors (Up/Down):   0 / 0
Line Profile:   Interleaved
Aut inveniam viam aut faciam

Quick update: Well, I moved my hub and have plugged it into the master test socket... Couldn't connect at all wirelessly, so I had to phone up the BT helpline, they changed the wireless channel and I got on after that (however the assistant said that my plugging into the socket should not have disabled the wireless.) As for the speed, well, needless to say there is little to no improvement. I cannot post my DSL stats, as I cannot even connect to my home hub via the ip address and the bthomehub.home address as the connection times out.
The speedtester on the other hand is working. Here are those results:
1. Best Effort Test: -provides background information.
Download Speed
409 Kbps
0 Kbps
500 Kbps
Max Achievable Speed
Download speedachieved during the test was - 409 Kbps
For your connection, the acceptable range of speedsis 100-500 Kbps.
Additional Information:
Your DSL Connection Rate :4704 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
IP Profile for your line is - 500 Kbps
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These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.
The results of this test will vary depending on the way your ISP has decided to use these traffic classes.
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Upload Speed
307 Kbps
0 Kbps
448 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 307 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 448 Kbps
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Oh and I have an engineer coming to the house on friday, turns out when my parents were installing the broadband accelerator they inadvertently knocked out the wires to the extensions and now none of the extensions in the house are working so I hope he or she can resolve things with my speed and I will update on Friday evening, and again next Wednesday(after the 5 day period) to see if the IP profile speed has improved.
Aut inveniam viam aut faciam

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Hi,
Tap Settings in your Home screen then tap General / Reset / Reset Network Settings.
Restart your iPad.
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Try ATV2 again.
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I have a fairly beefy Arch Linux computer, kernel 3.7.7-1-ARCH. However, recently it's been having random freeze ups. Never common, but it'd freeze for a good 15 seconds where no program is responsive. Sometimes the mouse freezes with it and the cursor doesn't move. After this happens, it'll usually happen 2 or 3 more times until I decide to just restart my computer.
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I run VMWare with 7 gigs of RAM assigned to it, however, my computer has 16G of RAM. When this last freeze up happened, I had 6G of RAM free. To give an idea, heres the header of top
KiB Mem: 16394208 total, 10194584 used, 6199624 free, 4 buffers
KiB Swap: 8388604 total, 103916 used, 8284688 free, 8788952 cached
I've seen some ways to disable khugepaged, but what bad effects could this cause? How can I just get it to behave better?
Typical mem info:
MemTotal: 16394208 kB
MemFree: 6542844 kB
Buffers: 4 kB
Cached: 8754308 kB
SwapCached: 21064 kB
Active: 1670140 kB
Inactive: 7846864 kB
Active(anon): 1408516 kB
Inactive(anon): 6826872 kB
Active(file): 261624 kB
Inactive(file): 1019992 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 8388604 kB
SwapFree: 8293100 kB
Dirty: 116 kB
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http://www.judahfrangipane.com/blog/2007/02/15/error-2032-stream-error/

Connection to file server slow and unreliable after upgrading to Leopard

I have a client with a G5 PowerMac (3 GB memory) who has been connecting reliably to a network file server (Windows based) at her company for years. Upon upgrading to Leopard the connections is slower. Or, rather, opening the root level directory is fast. The second level folder is fast. The third level is fast. Beyond that she gets the spinning cursor and it can take a long time to open, even if there are only a couple files inside. Also, navigating back to the first level I see a spinning cursor and "Connecting..." as though the Mac had lost connection with the file server simply by opening the volume. Sometimes she has to Force Quit the Finder (which reports "not responding". Weird. Any ideas out there?

Hi Greg,
It was my second visit to this company, and it was for something else that I was focussed on. I don't know what kind of server they are running. It's a PC house running Exchange servers so it's probably some kind of Microsoft system. If the problem persists I'l get more info next week when they reopen after the holiday.

Ath9k slow an unreliable; carl9170 randomly stalls

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