From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: Re: [Xen-users] Re: Xen 3.1 released! Date: Fri, 25 May 2007 15:56:25 +0200 Message-ID: <4656EB09.2080409@wpkg.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Keir Fraser Cc: "Petersson, Mats" , xen-devel@lists.xensource.com, xen-users@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Keir Fraser schrieb: > On 25/5/07 14:20, "Tomasz Chmielewski" wrote: > >>> Hmmm... That's not so explicable. Obviously something in save/restore is >>> causing unpageable allocations to happen. Could be pagetables for mappings >>> of HVM guest memory, or something like that. Needs investigating further, I >>> think. >> Could be. >> >> Now that I repeated the save/restore a couple of times, total RAM usage >> for dom0 jumps to ~700 MB sometimes during domain save (dom0 has now >> about 2.3 GB RAM, domU has 1.7 GB RAM; 4 GB RAM installed now in the >> machine). > > The only thing I would expect could so dramatically inflate dom0's memory > usage would be caching of disc blocks from the saved image file. But we > added explicit cache flushing to both domain-save and domain-restore before > releasing 3.1. The flushes are only advisory though, so perhaps they are > getting ignored for some reason. For your notice, I just saw 1.3 GB RAM usage when doing a 1.7 GB HVM domain save :) -- Tomasz Chmielewski http://wpkg.org