From: Wu Fengguang <fengguang.wu@intel.com>
To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Cc: Pekka Enberg <penberg@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>, Jens Axboe <jaxboe@fusionio.com>,
Linux Netdev List <netdev@vger.kernel.org>
Subject: Re: slow performance on disk/network i/o full speed after drop_caches
Date: Wed, 24 Aug 2011 17:33:36 +0800 [thread overview]
Message-ID: <20110824093336.GB5214@localhost> (raw)
In-Reply-To: <4E54BDCF.9020504@profihost.ag>
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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next prev parent reply other threads:[~2011-08-24 9:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4E5494D4.1050605@profihost.ag>
2011-08-24 6:20 ` slow performance on disk/network i/o full speed after drop_caches Pekka Enberg
2011-08-24 9:01 ` Stefan Priebe - Profihost AG
2011-08-24 9:33 ` Wu Fengguang [this message]
2011-08-25 9:00 ` Stefan Priebe - Profihost AG
2011-08-26 2:16 ` Wu Fengguang
2011-08-26 2:54 ` Stefan Priebe - Profihost AG
2011-08-26 3:03 ` Wu Fengguang
2011-08-26 3:13 ` Stefan Priebe
2011-08-26 3:26 ` Wu Fengguang
2011-08-26 3:30 ` Zhu Yanhai
2011-08-26 6:18 ` Stefan Priebe - Profihost AG
2011-08-31 7:11 ` Stefan Priebe - Profihost AG
2011-09-01 4:14 ` Wu Fengguang
2011-09-01 5:41 ` Stefan Priebe - Profihost AG
2011-09-01 12:57 ` Mel Gorman
2011-08-24 9:32 ` Wu Fengguang
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