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

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Message-ID: <20110824093336.GB5214@localhost>
Date:	Wed, 24 Aug 2011 17:33:36 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
Cc:	Pekka Enberg <penberg@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Jens Axboe <jaxboe@...ionio.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: slow performance on disk/network i/o full speed after
 drop_caches

On Wed, Aug 24, 2011 at 05:01:03PM +0800, Stefan Priebe - Profihost AG wrote:
> 
> >> 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.

Is it a NUMA machine and _every_ node has enough free pages?

        grep . /sys/devices/system/node/node*/vmstat

Thanks,
Fengguang

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