From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ulrich Schreiner Subject: kvm very slow Date: Wed, 01 Aug 2007 07:22:49 +0200 Message-ID: <1185945769.3342.15.camel@vaio> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: 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 hi, im using a 64 bit fedora7 system with a quad-core processor to host multiple virtual machines. my current kernel is: Linux testserver 2.6.22.1-27.fc7 #1 SMP Tue Jul 17 17:19:58 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux (now there is a 2.6.22.1-33.fc7 to download, but i think it is not the point here). i installed kvm.x86_64: 31-1.fc8 because of a crash i reported as a bug with the older kvm module. this system starts a F7 image with the following command: /usr/bin/qemu-kvm -net nic,macadr=52.54.00.12.34.57 -net tap,script=./ifup.py,ifname=tap0 -hda /var/qemu/vm_images/F7image.img -boot c: -m 512 -vnc :2 -k de inside the image there is fedora 7, but a 32bit system. almost everything works (reboot hangs), but the system is extremely slow! the clock inside the system is extremely slow: every *virtual* second in the image is about two or more seconds in the *real* world. the "clocksource=pit" argument does not help. but it is not only the clock ... the whole system is really slow! on the other side i have an notebook with an old core2 processor which cannot run KVM, so i run qemu/kqemu. if i start the image on this host, i have much better performance. inside the image there is an apache, subversion and a trac; all three systems are really fast on the notebook compared to the quadcore 64bit host! when starting qemu without kqemu i get a warning on console an poor performance. when starting "qemu-kvm" i get no warning, but the same poor performance. how can i check if the kvm-modules are really loaded? any other ideas what i can do? thanks ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/