netdev - Re: slow performance on disk/network i/o full speed after drop

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Message-ID: <4E54BDCF.9020504@profihost.ag>
Date:	Wed, 24 Aug 2011 11:01:03 +0200
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	Pekka Enberg <penberg@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Jens Axboe <jaxboe@...ionio.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: slow performance on disk/network i/o full speed after drop_caches


>> sync&&  echo 3>/proc/sys/vm/drop_caches&&  sleep 2&&  echo 0
>>> /proc/sys/vm/drop_caches

Another way to get it working again is to stop some processes. Could be 
mysql or apache or php fcgi doesn't matter. Just free some memory. 
Although there are already 5GB free.

Stefan
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