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 18:42:59 +0200 Message-ID: <46F15193.3090309@qumranet.com> References: <9a1a10a40709190930q549e5c73peacd0a1a1556ea14@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: <9a1a10a40709190930q549e5c73peacd0a1a1556ea14-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: > Hello, > > This is a followup from my last message stating that my guest os > dont load up correctly. The problem was that my xp or vista guest os > uses 100% cpu at startup and frequent lockup then continue to load. > > I played a bit with my startup parameters to find out that the problem > is related the to tap network interface, everything starts okay if I > remove the tap network from the startup parameters. > > So my original startup was : > kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net > nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 -net tap,ifname=tap0 & > > And now I used > kvm -no-rtc -hda disks/vista.qcow2 -localtime -m 512 -net > nic,model=ne2k_pci,macaddr=00:00:00:00:00:01 & > > And the guest os boots correctly. I have this problem with kvm-33 and > upward to kvm-40 (I didn't tryed older releases as I need vista). > > The thing is that I am using the tap interface to communicate with my > guest os and supply them with an Internet connection. So anyone have a > clue or something I may supply to help resolve this issue? > Interesting. Maybe your network is flooded with broadcasts. Try running wireshark or tcpdump on the tap interface and see if something is flowing through it at a high rate. -- 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/