----- Original Message -----

From: Metod Kozelj

To: Haifeng Li

Cc: iperf-users <at> lists.sourceforge.net

Sent: Tuesday, May 31, 2011 7:00 PM

Subject: Re: [Iperf-users] Is there any options for tcp like -b

Hi,

first the answer: there's no such thing as -b for TCP as far as I know. I may be wrong though.

Out of curiosity: why would you want to test network performance using TCP and with limited requirement for bandwidth? Not that this kind of testing is ilegitimate ...

BTW, it's great name (Haifeng) you've got ...

BR,
  Metod

Haifeng Li je dne 31/05/11 12:20 napisal-a:

Hi All,

 

I'm learning about iperf recently, and I very interested in it.

 

But I have a question, maybe funny , I hope to test network performance as a fixed value with tcp, just like "-b" option on udp. Is there any options for tcp like it. 

 

 

Thanks and regards,

Haifeng

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Must it be a file? Else it's easy :) You specifically said "text" file, so I don't see the advantage of using a file as input. I needed to do something similar, but I had to use a compressed file to test throughput on a WAN with compression AIC's in the routers... Fortunately a 500MB file was enough for me. I would say large files (if you must use them) with a shell script that loops iperf "sessions". You could overlap them so it's continuous, such that if it takes 60 secs to xfer the file, start iperf A, wait 55 seconds, then start Iperf B, then wait 55 seconds and go to start. This way A and B will always be running.

If you're trying to kill a pipe, disable TCP slow start and/or use UDP, but I don't recall if UDP can read a file.

Also, perhaps use a large binary file; such as a OS update, or complete OS ISO image. Those are nice and big!
 
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Oh, please note that depending on latency and other factors you may have to run multiple iperf sessions with tcp to keep the link saturated, especially once packets get lost. That's another reason I stick with udp when possible, it just blasts packets and doesn't care - good for saturating links / link validation. Easy to test at different packet sizes, rates, etc.
 
Must it be a file? Else it's easy :) You specifically said "text" file, so I don't see the advantage of using a file as input. I needed to do something similar, but I had to use a compressed file to test throughput on a WAN with compression AIC's in the routers... Fortunately a 500MB file was enough for me. I would say large files (if you must use them) with a shell script that loops iperf "sessions". You could overlap them so it's continuous, such that if it takes 60 secs to xfer the file, start iperf A, wait 55 seconds, then start Iperf B, then wait 55 seconds and go to start. This way A and B will always be running.

If you're trying to kill a pipe, disable TCP slow start and/or use UDP, but I don't recall if UDP can read a file.

Also, perhaps use a large binary file; such as a OS update, or complete OS ISO image. Those are nice and big!
 
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What is your command line ?

 

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