On Mon, Nov 08, 2010 at 04:00:09AM +0100, Dennis Jacobfeuerborn wrote: > Hi, > I just migrated from Fedora 11 to Fedora 14 (via a fresh install) and so > far everything seems fine kvm seems to have major issues. > After starting one Centos 5 VM qemu-kvm keeps using 20% of the cpu > according to top even though the VM is completely idle. Does anyone have a > clue what might cause this because I wasn't seeing this behavior under > Fedora 11.
Try adding divider=10 to the kernel boot command line for the guest. This will make it use a 100HZ tick rate, instead of 1000HZ, lowering the background idle load on the host. I doubt it accounts for 20%, but it is always worth doing for RHEL5 kernels since they don't have tickless mode. Regards, Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| _______________________________________________ virt mailing list [email protected] https://admin.fedoraproject.org/mailman/listinfo/virt
