Thanks Bob. I will run some tests using iperf2.0.11 with the -e and –vary-load
option.
I am trying to understand the impact on TCP performance with variation of
window size.
Thanks and regards,
Rajesh K
From: Bob McMahon <[email protected]>
Date: Friday, May 25, 2018 at 1:54 PM
To: "Kaliaperumal, Rajesh" <[email protected]>
Cc: iPerf User Group <[email protected]>
Subject: Re: iPerf Window size
Here is a good starting link:
https://fasterdata.es.net/host-tuning/linux/<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffasterdata.es.net%2Fhost-tuning%2Flinux%2F&data=01%7C01%7CRajesh.Kaliaperumal%40arris.com%7Ca9ad794bec3a49c7d70108d5c281bf08%7Cf27929ade5544d55837ac561519c3091%7C1&sdata=a%2FN4jpYKRpc9%2FrZDumsnTfUeA0qzOX496y%2BiXZMmbOA%3D&reserved=0>
Speaking for iperf2, the -w window size sets the socket buffer size.
There has been a lot of effort to reduce the windows per the buffer bloat
problem<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffasterdata.es.net%2Fhost-tuning%2Flinux%2F&data=01%7C01%7CRajesh.Kaliaperumal%40arris.com%7Ca9ad794bec3a49c7d70108d5c281bf08%7Cf27929ade5544d55837ac561519c3091%7C1&sdata=a%2FN4jpYKRpc9%2FrZDumsnTfUeA0qzOX496y%2BiXZMmbOA%3D&reserved=0>.
What exactly are you trying to influence with TCP by adjusting the window sizes?
If you use iperf
2.0.11<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsourceforge.net%2Fprojects%2Fiperf2%2F&data=01%7C01%7CRajesh.Kaliaperumal%40arris.com%7Ca9ad794bec3a49c7d70108d5c281bf08%7Cf27929ade5544d55837ac561519c3091%7C1&sdata=uc2dtIBdOPRosFue1N5A97PV31ULRBIaBy6TeSiLCYY%3D&reserved=0>
with -e and --vary-load you can get an idea how the congestion window and the
RTT are responding per the TCP offered load.
Bob
On Fri, May 25, 2018 at 1:39 PM, Kaliaperumal, Rajesh
<[email protected]<mailto:[email protected]>> wrote:
Hi all,
Can anyone explain or point me to some documentation that explains
how iPerf3 and iPerf2 handles the window size parameter?
I am trying to understand how to use this attribute for influencing the TCP
performance.
Thanks and regards,
Rajesh K
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