From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Goirand Subject: Re: [Pkg-xen-devel] Strange behavior when doing xm mem-set Domain-0 (was: Abnormal memory usage of dom0 under Squeeze leading to crash) Date: Wed, 23 Feb 2011 15:26:51 +0800 Message-ID: <4D64B6BB.90708@goirand.fr> References: <4D4A3F0C.6040607@debian.org> <20110203083413.GA19326@wavehammer.waldi.eu.org> <4D4A753E.7010106@goirand.fr> <20110203102935.GA28521@wavehammer.waldi.eu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20110203102935.GA28521@wavehammer.waldi.eu.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: pkg-xen-devel@lists.alioth.debian.org, "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org On 02/03/2011 06:29 PM, Bastian Blank wrote: > On Thu, Feb 03, 2011 at 05:28:30PM +0800, Thomas Goirand wrote: >> On 02/03/2011 04:34 PM, Bastian Blank wrote: >>> Please provide all informations. xm dmesg, the kernel log, xm info. >> How, if the server reboots when I do it? > > Well, then remove the call and gather the information before breaking > the system. For anything else, use a serial console. With the same server, when I put: GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=512M" in my /etc/default/grub, the dom0 is fine, running on 501 MB of RAM. If I don't put this option, then shrink from something like 8 GB (the server has 12 GB total) to bellow 800, it crashes, with no memory to release. That's strange, because with 512 MB to the dom0, only 180M is used, while when I give above 1GB, there's about 800MB of "used RAM", and it can't be freed. Any idea why it's ok to boot with 512MB on the dom0, but not ok to mem-set Domain-0 to it? To me, it seems more a Linux issue than a Xen one... Thomas