netdev - Re: [PATCH 2.6.23-rc6] NETWORKING : Edge Triggered EPOLLOUT events get missed for TCP sockets

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Message-Id: <20070919.090209.73655853.davem@davemloft.net>
Date:	Wed, 19 Sep 2007 09:02:09 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tomer_iisc@...oo.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.23-rc6] NETWORKING : Edge Triggered EPOLLOUT events
 get missed for TCP sockets

From: Nagendra Tomar <tomer_iisc@...oo.com>
Date: Wed, 19 Sep 2007 04:13:24 -0700 (PDT)

> With the SOCK_NOSPACE check in tcp_check_space(), this epoll_wait call will 
> not return, even when the incoming acks free the buffers.
>         Note that this patch assumes that the SOCK_NOSPACE check in
> tcp_check_space is a trivial optimization which can be safely removed.

I think the more correct fix is to fix whoever isn't
setting the SOCK_NOSPACE bit, that check really is
crucial.
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