From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: Configure block device IO rate Date: Mon, 24 Nov 2014 15:11:20 +0000 Message-ID: <1416841880.8878.7.camel@citrix.com> References: <7af096d19bfeabe5d2d5aba22887738a@cs.wisc.edu> <20141124150605.GA3946@laptop.dumpdata.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1XsvLa-00005I-RU for xen-devel@lists.xenproject.org; Mon, 24 Nov 2014 15:14:38 +0000 In-Reply-To: <20141124150605.GA3946@laptop.dumpdata.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Konrad Rzeszutek Wilk Cc: George Dunlap , xen-devel , aragrawal List-Id: xen-devel@lists.xenproject.org On Mon, 2014-11-24 at 10:06 -0500, Konrad Rzeszutek Wilk wrote: > On Mon, Nov 24, 2014 at 12:07:39PM +0000, George Dunlap wrote: > > On Mon, Nov 24, 2014 at 3:54 AM, aragrawal wrote: > > > Hi > > > > > > I am interested in getting the block I/O rate fixed for a Virtual Machine. > > > However, it seems that there are no such options to control the block I/O > > > rate via the VM configuration file. > > > Going through the net, I see suggestions to configure the xen_blkback driver > > > using ionice to get that done. > > > > > > I would like to know if there are any plans to include any such > > > configuration option. > > > Also, are there any particular reason (apart from the fact that there are > > > other ways to get this done) for the absence of such configuration option? > > > > I'm pretty sure it's just because nobody had asked for it yet. > > > > We can put it on our list of things to think about doing / projects > > for people new to the community. > > > > We also accept patches. :-) > > Patches for this were in the past posted - it just that nobody explained > to the maintainer (me) why the dm-* or io-nice would not do the same job. AIUI the question here is why the toolstack doesn't integrate a guest cfg file setting to configure dm-* and/or io-nice, rather than why blkback doesn't duplicate their functionality. Ian.