From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756611Ab1HXJdq (ORCPT ); Wed, 24 Aug 2011 05:33:46 -0400 Received: from mga14.intel.com ([143.182.124.37]:12965 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753358Ab1HXJdk (ORCPT ); Wed, 24 Aug 2011 05:33:40 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.68,274,1312182000"; d="scan'208";a="41839857" Date: Wed, 24 Aug 2011 17:33:36 +0800 From: Wu Fengguang To: Stefan Priebe - Profihost AG Cc: Pekka Enberg , LKML , "linux-mm@kvack.org" , Andrew Morton , Mel Gorman , Jens Axboe , Linux Netdev List Subject: Re: slow performance on disk/network i/o full speed after drop_caches Message-ID: <20110824093336.GB5214@localhost> References: <4E5494D4.1050605@profihost.ag> <4E54BDCF.9020504@profihost.ag> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4E54BDCF.9020504@profihost.ag> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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