On Thu, Mar 22, 2007 at 01:40:26PM +0200, Avi Kivity wrote: > Joerg Roedel wrote: > >Right. But it is possible for userspace to enable monitor bit for the > >guest. Without virtualization of these 2 instructions the guest would > >idle in the guest state after calling mwait and prevent other processes > >and guests from running in that time. > > Won't an interrupt during mwait cause a vmexit?
Yes, an interrupt would cause an vmexit. But depending on the HZ value of the host it may be a lot of time until the next interrupt. And over time this will sum up and slow down other tasks. Joerg -- Joerg Roedel Operating System Research Center AMD Saxony LLC & Co. KG ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
