linux-kernel - Re: [-next regression] TCP window full with EPOLLWAKEUP

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Date:	Sun, 20 May 2012 14:23:08 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	NeilBrown <neilb@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [-next regression] TCP window full with EPOLLWAKEUP

On Sunday, May 20, 2012, Jiri Slaby wrote:
> Hi,
> 
> a bisection shows that with the following commit from -next:
> commit 4d7e30d98939a0340022ccd49325a3d70f7e0238
> Author: Arve Hjønnevåg <arve@...roid.com>
> Date:   Tue May 1 21:33:34 2012 +0200
> 
>     epoll: Add a flag, EPOLLWAKEUP, to prevent suspend while epoll
> events are ready
> 
> ====
> 
> one of mono programs I use stops receiving data from the network.
> Wireshark shows that the TCP window of a connection is filled. This
> means the program does not read the data fast enough after requesting
> the data.
> 
> If I revert that commit on the top of -next (20120518), everything works
> as expected.

Hmm.  I suppose that the failing program doesn't set EPOLLWAKEUP by mistake,
does it?

Rafael
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