[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] cpufreq status information
>From: Jan Beulich [mailto:jbeulich@xxxxxxxxxx] >Sent: 2008年9月8日 22:31 > >>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 08.09.08 16:00 >>> >>After all, guest performance is at least as affected by CPU (and other >>resources) contention from other guests as it is by power-management >>governors in the hyeprvisor. Indeed, if the governors are >doing their job >>right then guest performance should not be considerably >impacted by them >>even in absolute terms. > >Right you say 'if' - what if not? How do I tell, especially >when I can't touch >the system and easily put a patched hypervisor and/or kernel on. If we >get a complaint from a customer that he thinks frequency >scaling doesn't >do what it's expected to, we'll need to have a simple mechanism at hand >to determine what's going on with his box. > Extend this complaint to the case, where a customer complains that he thinks frequency scaling on (v)cpu 0 doesn't do what it's expected to, how do you check what's going on if there's no fixed mapping between vcpu and pcpu, and no tool talking to xen directly... Thanks, Kevin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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