From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: Guest OS lock up with 100% cpu usage when using tap Date: Wed, 19 Sep 2007 20:16:26 +0200 Message-ID: <46F1677A.8040808@qumranet.com> References: <9a1a10a40709190930q549e5c73peacd0a1a1556ea14@mail.gmail.com> <46F15193.3090309@qumranet.com> <9a1a10a40709191018r78013446lb6bd3f280c708052@mail.gmail.com> <46F15AA8.8030304@qumranet.com> <9a1a10a40709191048w6ad0af3es8960e98dc08df2f5@mail.gmail.com> <46F16139.80400@qumranet.com> <9a1a10a40709191113t2e4a09bfs16701d31689368c2@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel To: Daniel Paquet Return-path: In-Reply-To: <9a1a10a40709191113t2e4a09bfs16701d31689368c2-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Daniel Paquet wrote: > Just tried -no-kvmirqchip and it's a no go, and after it I tryed > without taskset and -no-kvmirqchip and it worked... Anyway I will > allways use taskset until now. > Sorry, hard to piece all the info from the scattered reports. Please report, for each of: - regular - -no-kvm-irqchip - taskset Whether you get - reliable failure - sometimes works, sometimes doesn't - always works so I can try to find a pattern. Also, is tap required to reproduce the problem, or do you occasionally get it with -net user? > On 9/19/07, * Avi Kivity* > > wrote: > > Daniel Paquet wrote: > > Well well, that did it!!! > > > > For now I even restarted my host machine and the guest os boots > > flawlessly now with taskset! Oh well, I now know a new nice > linux app > > taskset :) > > > > I saw similar problems with some games under windows, that you > had to > > set the affinity to a specific core, if not you were getting those > > kind of small hang, like I was having with kvm and my guest > machines. > > > > And you guessed right I have a dual core cpu. > > > > Anyone have an idea why this is only happening when using a tap > > network interface? I am curious... > > No idea. > > Can you try one more thing? -no-kvm-irqchip, but no taskset. I'm > trying to find out if the smp issue is with the apic code or > elsewhere. > > -- > error compiling committee.c: too many arguments to function > > > > > -- > Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas > configurer Debian" > -- > Daniel Paquet -- Any sufficiently difficult bug is indistinguishable from a feature. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/