From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45804) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z7jr5-0008KD-Te for qemu-devel@nongnu.org; Wed, 24 Jun 2015 08:32:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z7jr0-0001NK-UX for qemu-devel@nongnu.org; Wed, 24 Jun 2015 08:32:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:54255) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z7jr0-0001N8-In for qemu-devel@nongnu.org; Wed, 24 Jun 2015 08:32:34 -0400 Message-ID: <558AA35E.8080604@redhat.com> Date: Wed, 24 Jun 2015 14:32:30 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <7c4c87b8.111fa.14df75bb798.Coremail.cauchy-love@163.com> <20150616130539.GC29405@stefanha-thinkpad.redhat.com> <79b03cb4.2428.14e0957997f.Coremail.cauchy-love@163.com> <5583D4C3.5060409@redhat.com> <5ec70e6c.267de.14e257e00ab.Coremail.cauchy-love@163.com> <558AA072.3080507@redhat.com> <79939a29.26a14.14e258d9cd6.Coremail.cauchy-love@163.com> In-Reply-To: <79939a29.26a14.14e258d9cd6.Coremail.cauchy-love@163.com> Content-Type: text/plain; charset=gbk Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Greate difference of disk I/O performance for guest on Qemu-2.30 of CentOS. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: cauchy-love Cc: Stefan Hajnoczi , "qemu-devel@nongnu.org" On 24/06/2015 14:31, cauchy-love wrote: > > Sorry, but I don't know what does bisect mean exactly.Could you > please explain it? I feel it might be some kernel configuration items > introduce this problem.I am also trying other kernel versions from > 2.6.34 to 2.6.38 (2.6.33.3 has good performance like 2.6.32) and will > show you the results. I meant exactly what you are already doing. Thanks! Paolo