Speed limit of UDP over gigabit ethernet

Dear Community,
I am trying to stream 10-20MBytes/sec over IP multicast from one LabVIEW application to several others. I think that UDP is probably the best way to go but I was wondering what kinds of network speeds people have been able to achieve?
I realize that this can be CPU and OS dependent. I'm using dual Xeon machines over a dedicated gigabit network. We are running Windows XP Pro.
For what it's worth, I am also trying to write the same data to disk at the same time.
Any and all tips appreciated.
Thanks!
Cas

Hi Cas,
80 MB/sec was the TCP/IP rate achieved by the questioner in this link.
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=137&HOID=50650000000500000002910100&HTHREAD=000102658&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
That Q in turn points to an earlier discussion where the results were also good.
Please let me know what kind of result you get. I am interested in this topic.
Trying to help,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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What file transfer speeds are possible over Gigabit Ethernet - Hatter?

Thanks in advance for taking the time to consider this.
Our still photgraphic studio has a range of MACs all connected via a gigabit D-Link switch to a series of Buffalo NAS raids. Wiring is CAT5e, all devices have gigabit ethernet cards and the link lights on the switch suggest that all devices are connected at that speed.
We currently get file transfer rates of between 5 and 12 MB/s depending on network traffic.
We would like to upgrade our NAS to a NAS/SAN, preferably using the existing wiring (and avoid the expense of Fibrenet). 50 or 60MB/s would be great if possible.
Any ideas for a suitable archtecture and Hardware would be gratefully received. Cable lengths are a maximum of 30 metres.
Paul

I'm getting sustained speeds of 90-100 megabytes/second on a transfer across GigE from one mac to another, both working on high-capacity SATA drives.
It drops to ~65 megabytes per second if the source drive is my 2TB Firewire 800 external.
both rates are right on the real-world maximum for GigE and FW800 respectively, which is a great sign that nothing else is bottlenecking the transfer.
My experience with NAS boxes has been disappointing in the past, with transfer rates of 5-35 MB/sec - painfully slow for large files, which destroys the purpose of NAS for me, which is reasonably high-speed off-computer storage.
I'm MUCH happier, and didn't have to pay very much to set up a Mac with 4 SATA drives onboard, acting as a file server... I'm actually getting files FASTER than I am from a FW800 drive directly attached now.

What's the maximum LAN speed with the Thunderbolt to Gigabit Ethernet Adapter on my MacBook Pro?

While I was at Yodobashi Camera yesterday, I got a Thunderbolt to Gigabit ethernet adapter for my MacBook Pro. I figure, since I'm paying for the high speed fiber optic (Sony Nuro), why limit my self to wi-fi speeds at home?
Before connecting the adapter, via wi-fi it the speed was 143.8 Mbps down and 181.5 Mbps up.
After connecting the adapter and making a direct LAN connection to the router, the speed is 783.2 Mbps down and 940.1 Mbps up.
I'm certainly happy with the speed, but since Sony Nuro is supposed to be 2 Gbps down and 1 Gbps up I was wondering what the maximum possible is with this computer and adapter. Before asking the provider I was curious what the maximum specs where.
The ether cable is a 3 m category 6.
Thanks,
doug

It's not really your computer that is getting the 2Gbps download - it is the router/ modem.
If you hooked better/ different hardware up you could probably push those speeds around your network too. The trouble is that most residential hardware is gigabit ethernet not fibre. Fibre cards & cable are expensive in comparison.
The existing hardware may allow you to 'bond or aggregate' multiple ethernet connections into one link to get more speed over ethernet. Obviously this requires more complex routers, switches & a network admin to set it up
Those speeds sound nice, this bottleneck will mean that other devices on you network can't choke up the whole connection & make other users sad.

NSS2000 - Data transfer speeds over gigabit ethernet

I've just installed a NSS2000 on a gigabit network. I'm aware that some of the promised features (like support for jumbo frames) are not currently supported by the current firmware (version 1.13).
However, even without jumbo frames, I'm puzzled of why I am seeing data transfer speeds of only 50megabits per second, or about 5% utilization of the 1000Mb/s connection. I was expecting at least 20% utilization.
Is this another limitation of the current firmware version, or is there a setting somewhere on the NSS2000 which I need to to tweak to increase data transfer speeds?
More background - it is the only significant traffic on the network during test, the ethernet controller driver on my PC is the latest available, and the NSS reports that it is connected at 1000MB/sec. The unit has two 1.5Tb SATA drives in it, which are configuered as RAID1.
Also - does anyone know when the next firmware version is going to be available, and which of the current known issues it is likely to address?
thanks
Graham

I should mention that the volume I am writing to is encrypted - is the answer simply that this is the fastest that the onboard CPU can decrypt the content?
An experiment to an unencrypted volume increased the LAN utilization to around 10% - so an improvement, but still not as high as I had hoped.
thanks
Graham

IMac i5 27" - gigabit ethernet speed slooooooow

I know there are other (older) threads about this (https://discussions.apple.com/thread/2236017?tstart=0) but I thought I'd start a new one.
I have just purchased an iMac i5 27", and find that plugging it into my Netgear GS605 gigabit ethernet switch doesnt work as expected. My older 24" iMac works as espected, just fine.
I am able to get a gigabit connection (green light on switch) and if I try to copy large files form another Mac or my Lacie 2Big Network 2 NAS it works fine. BUT, if I then try to surf the web, my download speeds are ridiculously low (should be 30MB/s, getting 0.4)??
If I manually downgrade the ethernet controller settings to 100B/T, the internet speed works just fine, but obviously local transfers are then crippled to fast ethernet speed, which on a 200GB Time Machine backlup isn't much fun!
I have had many conversations with Apple Support, and returned one of these iMac's already, to find the next one does the same thing - all very frustrating.
So is there a fix? Can the Broadcom chipset be to blame? Is it to do with Jumbo frame support (whatever that is) - the Netgear switch supports it, but not sure about the iMac, and why does the internet speed drop so dramatically, when the file transfer speed works as expected over gigabit ethernet?
Grrrrr. Really frustrating I can't have high speeds on both types of transfer.
Any help gratefully received!

verve62 wrote:
am i just dreaming, or is this unacceptable?
Unacceptable.
btw, i've already tried creating another user, and while things are ok in the beginning, slowly but surely the same symptoms begin to appear and then become chronic.
Have you tried Safe Mode (It will take more time to startup in Safe Mode because it runs a directory check.)
PS: i am sitting here proofreading this, and i can hear the machine every 5 seconds or so, going >"chunk-chunk" - ***!!??
That actually sounds like a bad hard drive. Run Apple Hardware Test
-mj

Gigabit ethernet vs Firewire

Hello,
Is it technically possible to use ethernet instead of firewire to connect hard drives to a computer ?? The GIGABIT (1000 vs 400-800) and CABLE LENGTH 15ft vs 45ft ???) could be serious advantages for ethernet over firewire.
Does a gigabit ethernet hard drive exist ?? Thanks in advance.
Robert

Robert,
I'm not sure what your budget or needs are, but I think in general, a directly attached Firewire 800 drive will be less costly, and be easier to set up that a NAS devise. All things being equal, I think NAS over Gigabit Ethernet is capable of out performing Firewire, but would require high performance from the LAN, and a higher cost NAS devise. The optimum transfer rate via Ethernet with the Iomega drive is listed at "100 Mb/s", quoting their web site.
I don't recall the theoretical speeds for all the drive types, hopefully someone will post, or try Googling for the specs.
The only other products I have experience with are the Lacie Ethernet Disk at home (only 100 Mb Ethernet, and not great performance), a Lacie portable Firewire drive (OK performance, purchased for it's portability), and Apple XSAN/XserveRAID at work (great performance, but uses Fiber Channel, high cost). Again, depending on your needs, there are a number of other vendors, hopefully someone will post that has direct experience with them.
Here's a couple links to more info that may help:
http://www.wiebetech.com/whitepapers/firewireevolution.pdf
http://www.it-enquirer.com/main/ite/printpage/234/

Dropping Gigabit Ethernet connection

Hello,
I found out a strange issue on my mac mini 2011 with Gigabit Ethernet port and what I see that it is works on automatic mode, in 100 mbit speed, but today I bought cisko 1 gbit switch and I still see in network utility 100 mbit. If I force the 1 gbit speed in seeting I will get error message like cable was unplugged.
Don't tell me that I have broken logic board. My varanty finished 2 months ago.
Thank you.

OK ****! - was I wrong...
After the above entry I packed up my MacBook, headed out to the Mac store and dropped it for repair; they had it overnight. "The Genius" called me to pick it up the next day. The answer:
There's nothing wrong with your MacBook. They copied files back and fourth between my MacBook and many other hosts on their network; it performed as expected.
I gave him a short history of the problem, and he said, "OOOOOooohhh, it's the Belkin." I brought my baby home, did a little research, found that others had a similar problem and found an acceptable fix. I ordered the new switches, a 5-port for my desk and an 8-port for the servers in the back room; incidentally, these items were inexpensive.
I swapped out the Belkin F4G0500 for the TrendNet TEG-S50g and everything started popping:
The MacBook received (and retained) a DHCP lease
Files copied between the Mac and other hosts at gigabit speeds
I should say the rest of my gear, 3 Linux Servers, a Linux Desktop/Laptop, and printer all made use of the Belkin at gigabit speeds (100MB file between Host A <--> Host B in 2 seconds), it was only the Mac that had trouble with the Belkins.
I split this evenly between Belkin and Apple as a responsibility to fix for we the buyers. It's 2012, we should have layer 3 (switching) sorted out by now. This was minor but pricey pain in the ***.
Troubleshooting Techniques:
Create Files of a Specific Size
You can use the "dd" (Unix) program to create files of a specific size. To test gigabit speeds, specific file sizes take the guessing out of the equation.
Open the Terminal (Utilities directory)
To create test files, enter both of the following lines (line one, then line two, giving each time to finish):
dd if=/dev/zero of=~/Desktop/output_100MB.dat bs=1M count=100   # Creates a 100MB file
dd if=/dev/zero of=~/Desktop/output_1GB.dat   bs=1M count=1000 # Creates a 1GB   file
The files created in Step 3 will now be on your desktop ready for transfer/testing.
Quit the Terminal.
File Transfer Calculator
This calculator will give you an approximation of what transfer times should be; at least it's close enough for me. There will be a little flux due to various (network) conditions, within 2-3 seconds it seems, but generally these estimations should hold.
For my problem, I wanted to test a 100MB & 1GB file transfer between 2 computers (both with Gigabit Network Cards) on the same switch.
EG: for the 2 files, I fill in the calculator:
100MB file: Size: 100; Size Lable: MB; Speed Lable: -none ; Select Speed by interface: Wired Lan Gigabit Ethernet --> click Calculate = estimated 2 seconds.
1GB file: Size: 1; Size Lable: GB; Speed Lable: -none ; Select Speed by interface: Wired Lan Gigabit Ethernet --> click Calculate = estimated 9 seconds.
Verify Gigabit Speeds on the Switch
The Trendnet ports will light up GREEN for each port that is functioning at gigabit (1000 Mbit/s) speeds; ports that are only running at Fast Ethernet speeds (100 Mbit/s) will light up AMBER. Transfers must occur between any 2 computers lit green on the switch.
When I copy the files to another (host) computer I see transfer times for:
The 100MB file is on the money: 100MB   50.0MB/s 00:02 seconds.
The 1GB file takes a little longer: 1000MB 47.6MB/s 00:21
Here we see approximately 50.0MB/s transfer times for both. The File Transfer Calc estimate was off by 12 seconds but I did notice that the transfer degraded slightly (in speed) the longer it persisted; even though that's true, the MB/s is similar.
If you have a similar setup as me (1 switch under your desk, and 1 in the server room), repeat the transfers to (hosts) computers in the back room with a green light on the switch. The transfers should be similar if not the same.
It's not perfect but it's a week later and I'm almost $200 down; it's close enough for jazz and better than what I had before. I'm tired of screwing with it.
Cheers all,
TT

Usage or advantage of Dual Gigabit Ethernet

Just for my curiosity and knowledge, what is the advantage and usage of having a Dual Gigabit Ethernet behind the Mac Pro?
Any examples? or Articles I can read?
thank you

You can use the first one for Internet-bound and local traffic, the second for a local File Server.
IF you have a device that explicitly supports the required bonding protocol, you can bond the two links for even faster transfers.
The speed of even a single Gigabit Ethernet link exceeds almost every Internet connection, so the main benefit is in local file transfers (to other computers or servers).

How do I maximize LAN speeds using Gigabit Ethernet, jumbo frames?

I move a lot of large files (RAW photos, music and video) around my internal network, and I'm trying to squeeze out the fastest transfer speeds possible. My question has to do both with decisions about hardware and what settings to use once it's all hooked up.
This is what I have so far:
-- imac 3.06GHz, macbook pro 2.53GHz
-- Cisco gigabit smart switch capable of jumbo frames
-- Buffalo Terastation Duo NAS (network attached storage), also capable of Gbit and jumbo frames
-- All wired up with either cat6 or cat53e.
-- The sizes of the files I'm moving would include large #s of files at either 15MB (photos), 7MB (music), 1-2GB (video) and 650MB (also video).
-- jumbo frames have been enabled in the settings of the macs, the switch and the buffalo HD.
-- I've played with various settings of simultaneous connections (more of a help with smaller files), no real difference
-- Network utility shows the ethernet set to Gbit, with no errors or collisions.
-- have tried both ftp and the finder's drap and drop
-- also, whenever I'm doing a major move of data, I kick my family off the network, so there is no other traffic that should be interfering.
Even with all that, I'm still lucky to get transfer speeds at 15-20mbps, but more commonly at around 10. The other odd thing I've encountered while trying to up my speeds, is that I might start out a transfer at maybe 60mbps, it will maintain that for about 30-60sec and then it appears to ramp itself down, sometimes to as low as 1-5mbps. I'm starting to think my network is mocking me
I also have a dual band (2.4/5) wireless n router (not jumbo frame capable), but I'm assuming wired is going to trump wireless? (NOTE: in my tests, I have disabled wireless to force the connection through the ethernet).
Can anyone help with suggestions, and/or suggest a strong networking reference book with emphasis on mac? I'm willing to invest in additional equipment within reason.
Thanks in advance!
juliana

I'm going to pick and choose to answer just a few of the items you have listed. Hopefully others will address other items.
• This setup was getting me speeds as high as 10-15MB/sec, and as low as 5-6MB/sec when I was transferring video files around 1-2 GB in size
I would think a single large file would get the best sustained transfer rates, as you have less create new file overhead on the destination device. It is disturbing that the large files transfer at a slower rate.
• Would a RAID0 config get me faster write speeds than RAID1? I have another NAS that can do other RAID configs, which is fastest as far as write times?
RAID0 (Striped) is generally faster, as the I/O is spread across 2 disks.
RAID1 is mirrored, so you can not free the buffer until the same data is on BOTH disks. The disks are NOT going to be in rotational sync, so at least one of the disks will have to wait longer for the write sectors to move under the write heads.
But RAID1 gives you redundency. RAID0 has not redundency. And you can NOT switch back and forth between the 2 without reformatting your disks, so if you choose RAID0, you do not get redundency unless you provide your own via a backup device for your NAS.
• what is the most efficient transfer protocol? ftp? smb? something else? And am I better off invoking the protocol from the terminal, or is the overhead of an app-based client negligible?
Test the different transfers using a large file (100's of MB or a GB sized file would be good as a test file).
I've had good file transfers with AFP file sharing, but not knowing anything about your NAS, I do not know if it supports AFP, and if it does, whether it is a good implementation.
If your NAS supports ssh, then I would try scp instead of ftp. scp is like using cp only it works over the network.
If your NAS support rsync, that would be even better, as it has the ability to just copy files that are either NOT on the destination or update files which have changed, but leave the matching files alone.
This would help in situations where you cannot copy everything all at once.
But no matter what you choose, you should measure your performance so you choose something that is good enough.
• If a client is fine, does anyone have a suggestion as to best one for speed? Doesn't have to be free -- I don't mind supporting good software.
Again just test what you have.
• Whats a good number to allow for simultaneous connections, given the number of files and their size?
If the bottleneck is the NAS, then adding more I/O that will force the disk heads to move away from the current file being written will just slow things down.
But try 2 connections and measure your performance. If it gets better, then maybe the NAS is not the bottleneck.
• What question am I not asking?
You should try using another system as a test destination device in the network setup to see if it gets better, worse, or the same throughput as the NAS. You need to see about changing things in your setup to isolate where the problem might be.
Also do not rule out bad ethernet cables, so switch them out as well. For example, there was a time I tried to use Gigabit ethernet, but could only get 100BaseT. I even purchased a new gigabit switch, thinking the 1st was just not up to the task. It turned out I had a cheap ethernet cable that only had 4 wires instead of 8 and was not capable of gigabit speeds. An ethernet cable that has a broken wire or connector could exhibit similar performance issues.
So change anything and everything in your setup, one item at a time and use the same test so you have a pear to pear comparision.

I get slow *** tranzfer speeds over da Ethernet. Why dis?

Hello, I have a pc running windows 8.1 and a Mac Pro (2006 edition) that are on the same router (both via ethernet). I have them both connected to each other using their respective "connect to another computer" features, and thus can access each other's hard drives. With that said, when I transfer data from one to the other (say, from the Mac to the PC), it results in slow *** transfer speeds (between 4 and 10 MB/s max). Why? (I have accounted for the usual-suspect variables, such as hard drives, and ethernet cables by using different hard drives and ethernet cables.) it has been at 3 MB/s for about 40 minutes now. Why?

Each computer should be wired to your Gigabit Ethernet capable SWITCH or Router. If you do not have a Gigabit Ethernet capable SWITCH or your Router ports are slower than Gigabit speed, Apple sells a five-port Gigabit Ethernet SWITCH in the Apple online store for about US$55.
Computer-to-Computer File transfers are handled directly by the SWITCH, they do not need to use the Router function.
Gigabit Ethernet requires cables with all 8 wires present, and Power-over-Ethernet is not allowed on those cables.

Problem speeding up to gigabit ethernet

Hello,
Hopefully someone here will be kind enough to help me out with this one...
Im trying to set up a gigabit ethernet network with my PowerBook G4 12" 1.5 GHz, a gigabit switch, and an iBook G4 1.2 GHz. The problem is that when I connect everything together I only get 100baseTX speeds max. On both the iBook and PB if I go into Network Preferences and configure ethernet speed Manually (Advanced) it only shows autoselect, 10baseT, and 100baseTX. No 1000base...
I have tried multiple cat 5e and 6 cables, all known good.
I have also tried the setup without the gigabit switch (ethernet cable between the two computers) and still get the same result.
Oh and both systems are running 10.4.7
Any help with this would be very much appreciated.
Thanks in advance!
PowerBook G4 1.5 GHz, a gigabit switch, iBook G4 1.2 GHz Mac OS X (10.4.7)

No problemo. At least now you won't be tearing your hair out trying to figure out why you can't get the data moving any faster. Happy 4th.

Using Xsan to carry data over dual gigabit ethernet connections?

A designer (mostly non-technical) colleague of mine has claimed that Xsan transfer data (not metadata) over dual gigabit ethernet, in lieu of Fiber Channel, with metadata flowing over a third ethernet. Is this true? Has anyone done an install in this manner? I can't find any reference of this, anywhere.
If anyone can help shed some light on this, I would appreciate it!
Thanks,
Ben

If you're planning on connecting to the SAN in this manner, be aware that the amount of bandwidth is MUCH smaller than fibre channel. (That's why X-SAN used fibre between clients and the SAN)
So... if you're thinking of pulling uncompressed HD through ethernet (even Dual Ethernet) you're going to be woefully disappointed.
Having said that, we regulary connect dozens of "story editors" to our X-SAN via a single gig E "reshared" connection. The secret is that we ONLY use "off-line RT" media for this connection. We've locked out our "Full Res" media from this kind of connection because it will only jam up the system and bring our internal system to it's knees. I would regard this kind of "tapping in" to the SAN as a "secondary" method, not your primary way of accessing the media.
Good luck.
mark

Aggregation 4 gigabit ethernet low speed

Hello
I've got a Synology DiskStation DS3612xs (Ultra-high performance of 1000+ MB/sec throughput and 100,000+ IOPS)
connected to my MAC PRO with 4 gigabit Ethernet connection with Link Aggregation,
and I only got 233.9Mo/s
the same performance with dual gigabit link aggregation.
What am I doing wrong to get the same speed result with 2 link aggregation than with 4 link aggregation ??
is this a apple bug ?

no the 4 link aggregat by apple is not fast enough.
if I have to different computer connected to my DiskStation via 2aggregat ethernet
each computer got 233.9Mo/s speed.
but when I connect only one computer via 4aggregat ethernet : I got only 233.9Mo/s speed
BUT I should have the +/- 466 Mo/s speed as I got with the 2 different computers insn't ???
Please help.
Thanks anyway

Not getting full Gigabit Ethernet Speed on iMac Core Duo

I am using Airport to connect to a Linksys Wireless Access Point connected to my DSL modem. I am using ethernet to connect to a 3Com OfficeConnect 8-port Gigabit switch. I have 2x 500 GB LaCie Ethernet Disk Mini's (with Gigabit interface) connected to the switch.
The lights on the switch tell me that the drives and iMac are connected at full speed, however I can transfer a 650MB .dmg file to a firewire 400 drive in 1/4 of the time it takes to transfer the same file to one of the gigabit ethernet drives.
running ifocnfig en0 returns:
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::216:cbff:fe94:747b%en0 prefixlen 64 scopeid 0x4
inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
ether 00:16:cb:94:74:7b
media: autoselect (1000baseT <full-duplex,flow-control>) status: active
supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control> none
I have no idea what that all means, but i do know that I am not getting gigabit ethernet speed.
Can anyone help?
Thanks

If you are transferring data via wireless then you cannot approach Gigabit Ethernet speed. 802.11g has a maximum transfer speed of 54 Mbps while 802.11n is about 130 Mbps. This is much slower than a FW400 port. Your router and switch must both be Gigabit capable and your drive must be connected to Ethernet to even hope to achieve Gigabit speeds - no wireless.

Cisco Catalyst 4507R Module WS X4424GB RJ 45, Multi-speed Gigabit Ethernet Switching Module (24-port)

i am confused if this one
Cisco Catalyst 4507R Module WS X4424GB RJ 45, Multi-speed Gigabit Ethernet Switching Module (24-port)
would be compatible to its chasis if change by this one
WS-X4424-GBRJ45-RF
Catalyst 4000 24port 101001000 Module RJ45 REFURBISHED

Yes it you get the refurbished with the good one then it would get detected and works fine.
BTW- This module is EOL /EOS and below is the replacement part for the same:
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-4500-series-switches/eol_c51_574038.html
WS-X4424-GB-RJ45
Catalyst 4500 24-port 10/100/1000 Module (RJ45)
Replacement-PartWS-X4548-GB-RJ45
Catalyst 4500 Enhanced 48-Port 10/100/1000 Base-T (RJ-45)
HTH
Regards
Inayath
***** Plz rate all usefull posts.

Speed limit of UDP over gigabit ethernet

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