From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ankit Agrawal Subject: Re: Configure block device IO rate Date: Mon, 24 Nov 2014 16:30:23 -0600 Message-ID: <5473B17F.3070200@cs.wisc.edu> References: <7af096d19bfeabe5d2d5aba22887738a@cs.wisc.edu> <20141124150605.GA3946@laptop.dumpdata.com> <1416841880.8878.7.camel@citrix.com> <20141124152039.GC3946@laptop.dumpdata.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta4.messagelabs.com ([85.158.143.247]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1Xt29Q-0002lT-Ql for xen-devel@lists.xenproject.org; Mon, 24 Nov 2014 22:30:32 +0000 In-Reply-To: <20141124152039.GC3946@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 , Ian Campbell Cc: George Dunlap , xen-devel List-Id: xen-devel@lists.xenproject.org On 11/24/2014 09:20 AM, Konrad Rzeszutek Wilk wrote: > On Mon, Nov 24, 2014 at 03:11:20PM +0000, Ian Campbell wrote: >> 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. > Ah, that is a different question. That certainly could be done by somebody > who has the time. >> Ian. >> >> Hi Thanks for the quick reply. I see the time constraint is the only issue here. Regards Ankit Agrawal