On 09/04/2012 11:08 AM, Nikunj A Dadhania wrote: > On Tue, 04 Sep 2012 10:51:06 +0300, Avi Kivity <avi@xxxxxxxxxx> wrote: >> On 09/04/2012 04:30 AM, Nikunj A Dadhania wrote: >> > On Mon, 03 Sep 2012 17:33:46 +0300, Avi Kivity <avi@xxxxxxxxxx> wrote: >> >> On 08/21/2012 02:25 PM, Nikunj A. Dadhania wrote: >> >> > >> >> > kernbench(lower is better) >> >> > ========================== >> >> > base pvflushv4 %improvement >> >> > 1VM 48.5800 46.8513 3.55846 >> >> > 2VM 108.1823 104.6410 3.27346 >> >> > 3VM 183.2733 163.3547 10.86825 >> >> > >> >> > ebizzy(higher is better) >> >> > ======================== >> >> > base pvflushv4 %improvement >> >> > 1VM 2414.5000 2089.8750 -13.44481 >> >> > 2VM 2167.6250 2371.7500 9.41699 >> >> > 3VM 1600.1111 2102.5556 31.40060 >> >> > >> >> >> >> The regression is worrying. We're improving the contended case at the >> >> cost of the non-contended case, this is usually the wrong thing to do. >> >> Do we have any clear idea of the cause of the regression? >> >> >> > Previous perf numbers suggest that in 1VM scenario flush_tlb_others_ipi >> > is around 2%, while for contented case its around 10%. That is what is >> > helping contended case. >> >> But what is causing the regression for the uncontended case? >> > Haven't been able to nail that, any clue on how to profile would help. perf top, perf kvm top, kvm_stat should help. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
