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

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Message-ID: <Pine.LNX.4.64.0709191552171.2989@alien.or.mcafeemobile.com>
Date:	Wed, 19 Sep 2007 16:11:45 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	David Miller <davem@...emloft.net>
cc:	tomer_iisc@...oo.com, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2.6.23-rc6 Resending] NETWORKING : Edge Triggered EPOLLOUT
 events get missed for TCP sockets

On Wed, 19 Sep 2007, David Miller wrote:

> From: Nagendra Tomar <tomer_iisc@...oo.com>
> Date: Wed, 19 Sep 2007 15:37:09 -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 already replied to your patch posting explaining that whatever is
> not setting SOCK_NOSPACE should be fixed instead.
> 
> Please address that, thanks.

You're not planning of putting the notion of a SOCK_NOSPACE bit inside a 
completely device-unaware interface like epoll, I hope?



- Davide


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