netdev - Re: [RFC] random SYN drops causing connect() delays

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Message-ID: <20100412083903.GA19763@bombadil.infradead.org>
Date:	Mon, 12 Apr 2010 04:39:03 -0400
From:	Thomas Graf <tgraf@...radead.org>
To:	netdev@...r.kernel.org
Subject: Re: [RFC] random SYN drops causing connect() delays

On Mon, Apr 12, 2010 at 04:06:33AM -0400, Thomas Graf wrote:
>  - While the issue is appearing, the acceptq seems to be overflowing. Both
>    LISTENOVERFLOWS and LISTENDROPS are increasing although not by the exact
>    number of delay occurences. inetdiag reports sk_max_ack_backlog to be 0
>    therefore one possibility that comes to mind is that sk_ack_backlog
>    underflows due to a race.

Forget about the underflow thought, inetdiag was reporting falsely.
sk_max_ack_backlog is set to 128 as it should and the listen overflow
happens normally. Still the fact remains that while the issue is appearing
listen overflows are counted.
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