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

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Message-ID: <4FB81981.3050509@suse.cz>
Date:	Sun, 20 May 2012 00:06:57 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Arve Hjønnevåg <arve@...roid.com>
CC:	NeilBrown <neilb@...e.de>, "Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>
Subject: [-next regression] TCP window full with EPOLLWAKEUP

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.

regards,
-- 
js
suse labs

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