From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:58524) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QRPLm-0005xR-Jx for qemu-devel@nongnu.org; Tue, 31 May 2011 09:51:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QRPLi-0004OT-SV for qemu-devel@nongnu.org; Tue, 31 May 2011 09:51:14 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:45555) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QRPLi-0004No-NB for qemu-devel@nongnu.org; Tue, 31 May 2011 09:51:10 -0400 Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e39.co.us.ibm.com (8.14.4/8.13.1) with ESMTP id p4VDb1bl008429 for ; Tue, 31 May 2011 07:37:01 -0600 Received: from d03av06.boulder.ibm.com (d03av06.boulder.ibm.com [9.17.195.245]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.1) with ESMTP id p4VDoimN127944 for ; Tue, 31 May 2011 07:50:58 -0600 Received: from d03av06.boulder.ibm.com (loopback [127.0.0.1]) by d03av06.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p4VDttni017518 for ; Tue, 31 May 2011 07:55:55 -0600 Message-ID: <4DE4F230.2040203@us.ibm.com> Date: Tue, 31 May 2011 08:50:40 -0500 From: Anthony Liguori MIME-Version: 1.0 References: <20110530050923.GF18832@f12.cn.ibm.com> <20110531134537.GE16382@redhat.com> In-Reply-To: <20110531134537.GE16382@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC]QEMU disk I/O limits List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Vivek Goyal Cc: kwolf@redhat.com, stefanha@linux.vnet.ibm.com, kvm@vger.kernel.org, guijianfeng@cn.fujitsu.com, qemu-devel@nongnu.org, wuzhy@cn.ibm.com, herbert@gondor.hengli.com.au, Zhi Yong Wu , luowenj@cn.ibm.com, zhanx@cn.ibm.com, zhaoyang@cn.ibm.com, llim@redhat.com, Ryan A Harper On 05/31/2011 08:45 AM, Vivek Goyal wrote: > On Mon, May 30, 2011 at 01:09:23PM +0800, Zhi Yong Wu wrote: >> Hello, all, >> >> I have prepared to work on a feature called "Disk I/O limits" for qemu-kvm projeect. >> This feature will enable the user to cap disk I/O amount performed by a VM.It is important for some storage resources to be shared among multi-VMs. As you've known, if some of VMs are doing excessive disk I/O, they will hurt the performance of other VMs. >> > > Hi Zhiyong, > > Why not use kernel blkio controller for this and why reinvent the wheel > and implement the feature again in qemu? blkio controller only works for block devices. It doesn't work when using files. Regards, Anthony Liguori