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 19:21:44 +0200 Message-ID: <46F15AA8.8030304@qumranet.com> References: <9a1a10a40709190930q549e5c73peacd0a1a1556ea14@mail.gmail.com> <46F15193.3090309@qumranet.com> <9a1a10a40709191018r78013446lb6bd3f280c708052@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Daniel Paquet Return-path: In-Reply-To: <9a1a10a40709191018r78013446lb6bd3f280c708052-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: > Okay I just rebooted. > > Now the guest os takes forever to startup with the same behaviour as > before. > > I have no traffic on my tap device. The only trafic on tap device is > from the guest os and for now there is not much. > And here is the output of dmesg > > apic write: bad size=1 fee00030 > Ignoring de-assert INIT to vcpu 0 > kvm: emulating exchange as write > > And the cpu usage it to 100% by system not user when locking up and > goes to user when running. It runs for 2-3 sec then hang and goes to > 100% cpu usage by system for 10 sec or more. > > Im getting the same behaviour with my firewall (nat) disabled. > I just removed the tap device from the startup parameters and voila > the guest boots with no problems. > > I reinsert my tap parameter and the guest os dont boot as before still > with nat and firewall disabled, tap device is up with an ip address. > > Im still trying to do anything to solve this issue :-), feel free to > give some suggestions :). > What about taskset? 'taskset 1 qemu ...' -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- 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/