netdev - Re: TCP-MD5 checksum failure on x86

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Date:	Fri, 07 May 2010 11:37:19 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Bhaskar Dutta <bhaskie@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: TCP-MD5 checksum failure on x86_64 SMP

Le vendredi 07 mai 2010 à 14:29 +0530, Bhaskar Dutta a écrit :

> Eric,
> 
> Thanks a lot! I will test it out and let you know.
> BTW this patch seems to essentially do the same as the earlier fix you
> had posted (where you just do bh disable/enable).
> Am I missing something?
> 
> With the earlier fix, I ran load tests with 80 TCP connections for
> over 6 hrs and found 5 bad checksum packets.
> So there is still a problem. Without the fix I see a bad packet every
> minute or so.

My second patch is cleaner, using only out of line code (inline was not
necessary and made include file bigger than necessary). Inline is fine
if we can avoid a function call, but it was not the case.

If you notice another corruption, it may be because of another problem,
yet to be discovered.

To you have a userland suite to test/stress tcp md5 connections ?



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