netdev - Re: [PATCH] tcp: fix a timewait refcnt race

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Date:	Thu, 3 Dec 2009 19:20:21 -0800
From:	kapil dakhane <kdakhane@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter@...r.kernel.org, Evgeniy Polyakov <zbr@...emap.net>
Subject: Re: [PATCH] tcp: fix a timewait refcnt race

Eric,

On Thu, Dec 3, 2009 at 2:49 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:

> I believe I found another timewait problem, I am not sure
> it is what makes your test fail, but we make progress :)
>
> I cooked a patch against last net-next-2.6 + my previous patch.
>
> (2nd take of [PATCH net-next-2.6] tcp: connect() race with timewait reuse)
>
> [PATCH net-next-2.6] tcp: fix a timewait refcnt race
>

I applied your changes are suggested above. It appears that the patch
successfully resolves the race condition it addressed. I managed to
push the system to 1.9 gbps, previously I could not push it beyond 1.6
gbps. Unfortunately, there appear to be more race conditions, as the
fault happened again when I attempted to push it to 2.3 gbps. This
time I did not get any error message in /var/log/messages, although
they appear on the console the same way as before.

Kapil
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