linux-kernel - Re: 2.6.38-rc echo 3 > /proc/sys/vm/drop

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Message-ID: <20110315185913.GH2140@cmpxchg.org>
Date:	Tue, 15 Mar 2011 19:59:13 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Hans de Bruin <jmdebruin@...net.nl>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: 2.6.38-rc echo 3 > /proc/sys/vm/drop_caches repairs mplayer
 distortions

linux-mm cc'd

On Mon, Mar 14, 2011 at 10:34:31PM +0100, Hans de Bruin wrote:
> Since the start of the start of 2.6.38-rc I sporadic have problems
> with mplayer. A mpeg stream sometimes gets distorted when mplayer
> starts. An example is at http://www.xs4all.nl/~bruinjm/mplayer.png .
> I do not know how to trigger the behaviour, so bissecting is not
> possible. Since yesterday however I found a way to 'repair' mplayer:
> 
> echo 3 > /proc/sys/vm/drop_caches
> 
> This repairs mplayer while it is running.

While echo is running?  Or does one cache drop fix the problem until
mplayer exits?  Could you describe exactly the steps you are going
through and the effects they have?

Thanks!

> My latop is runs on nfsroot, and the mpegstreams are payed over nfs
> or http. I can have two instances of mplayer running the same mpeg
> stream over nfs or http with only one instance distorded.
> 
> -- 
> Hans
> 
> --
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