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Message-ID: <4711159D.1010305@unsolicited.net>
Date: Sat, 13 Oct 2007 19:59:41 +0100
From: David <david@unsolicited.net>
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To: Peter Volkov <pva@gentoo.org>
CC: linux-kernel@vger.kernel.org
Subject: Re: regression(?): starting with 2.6.21 sending packets became broken.
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Peter Volkov wrote:
> Hello, all on the list.
>
> Please CC me in answers, I'm not subscribed. Please, if this is wrong
> list tell me what is correct.
>
> Starting with 2.6.21 (or may be 2.6.20 as I have not tried it) kernel I
> have problem that most tcp based services freeze at some point of
> operation. I've noticed this first on ssh but then found out that at
> lease one other service became similarly. The problem sites somewhere in
> the kernel as I've compiled 2.6.19, 2.6.21, and 2.6.22 with the
> similar .config options (of course not exact, as some options does not
> exist in some kernels, but seems that enabled options are all the same)
> but I have this problem only with the 21 and 22. I've tried to debug the
> problem a bit, but not a lot as that is production box working as linux
> based firewall/router.
>   
Try

echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

I bet you have broken router(s) between your machine and the problem
site(s).

Cheers
David
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