From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43121) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YiiQA-0004Ev-0p for qemu-devel@nongnu.org; Thu, 16 Apr 2015 07:57:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YiiQ6-00053Y-SX for qemu-devel@nongnu.org; Thu, 16 Apr 2015 07:57:25 -0400 Received: from mail-wi0-x22d.google.com ([2a00:1450:400c:c05::22d]:36916) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YiiQ6-00053N-L7 for qemu-devel@nongnu.org; Thu, 16 Apr 2015 07:57:22 -0400 Received: by widdi4 with SMTP id di4so94397823wid.0 for ; Thu, 16 Apr 2015 04:57:21 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <552FA39C.7080209@redhat.com> Date: Thu, 16 Apr 2015 13:57:16 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <552E1EB4.3030805@clodo.ru> <20150416012735.GB21291@ad.nay.redhat.com> <552F9A4F.90504@clodo.ru> In-Reply-To: <552F9A4F.90504@clodo.ru> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] virtio-blk and virtio-scsi performance comparison List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: kkv@clodo.ru, Fam Zheng Cc: qemu-devel@nongnu.org On 16/04/2015 13:17, Konstantin Krotov wrote: > In my production system i'm interested to use io=thread, becouse i > export MD raid1 devices to guest's and i need to read from the MD device > performs balanced between raid1 legs (it's true only if io=thread). Can you detail the problem more? That could be a kernel bug. Paolo