netdev - Re: IPV4 TCP connection reset using iperf

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Date:	Tue, 08 Jan 2013 09:39:36 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Madhvapathi Sriram <sriram.madhvapathi@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: IPV4 TCP connection reset using iperf

On 01/08/2013 06:41 AM, Madhvapathi Sriram wrote:
> Hi,
>
> I have recently migrated to kernel version 3.6.10 from 3.2.1. I was
> running iperf to routinely measure TCP throughput and I have been
> facing problems eversince. I am using a wireless interface.
>
> wireless client: iperf -s -i 1 -w 1024K
> wireless server: iperf -c 192.168.1.1 -i -1 -w 1024 -t 600
>
> While, the connection is maintained for sometime and the perf logs
> keep going. Randomly, the connection breaks with the server side
> resetting the connection. The tcp dump on the client shows RST sent by
> the server. Switching back to 3.2.1 works. This issue starts from
> kernel version 3.5 onnwards.
>
> I have tried to probe along some points to take a look at the air
> logs, tcpdump on either sides but to no clue - everything seems normal
> like, the tcp window values, very less/negligible retransmissions and
> so on. The RST is set abruptly and randomly (no definite time - may
> happen randomly).
>
> I am looking for some suggestions or pointers towards analyzing the issue.

I cannot imagine that iperf bulk transfer would look all that much 
different from netperf bulk transfer, but I suppose you could see if a 
netperf TCP_STREAM test with similar configuration settings encounters 
the same RST issues.  Or, for that matter, an equally long-lived FTP or 
scp transfer.

rick jones

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