From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: Re: problems running many guests Date: Thu, 1 May 2008 21:16:53 -0300 Message-ID: <20080502001653.GB6721@dmt> References: <200805011800.45167.kmr@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel@lists.sourceforge.net To: Karl Rister Return-path: Content-Disposition: inline In-Reply-To: <200805011800.45167.kmr@us.ibm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces@lists.sourceforge.net Errors-To: kvm-devel-bounces@lists.sourceforge.net List-Id: kvm.vger.kernel.org On Thu, May 01, 2008 at 06:00:44PM -0500, Karl Rister wrote: > Hi > > I have been trying to do some testing of a large number of guests (72) on a > big multi-node IBM box (8 sockets, 32 cores, 128GB) and I am having various > issues with the guests. I can get the guests to boot, but then I start to > have problems. Some guests appear to stall doing I/O and some become > unresponsive and spin their single vcpu at 100%. Does -no-kvm-irqchip or -no-kvm-pit makes a difference? If not, please grab kvm_stat --once output when that happens. Also run "readprofile -r ; readprofile -m System-map-of-guest.map" with the host booted with "profile=kvm". Make sure all guests are running the same kernel image. The profiling should be easier to understand if you have 1 guest spinning and remaining ones idle. ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone