Kvm slow windows 2008 server with ms sql
KVM slow with win 2008 server installed with ms sql
Apparantly MS implemented a new timer system on sql servers which makes the host cs 1024/sec.
This is quite annoying and will up your cpuload from having to switch constantly alone.
Easy fix is to disable the new timer system and revert to the old.
A workaround is listed here:
In my case it brough the guest down from ~30-40% constant cputime to about 5-10%.