On 10/04/2012 03:07 PM, Peter Zijlstra wrote: > On Thu, 2012-10-04 at 14:41 +0200, Avi Kivity wrote: >> >> Again the numbers are ridiculously high for arch_local_irq_restore. >> Maybe there's a bad perf/kvm interaction when we're injecting an >> interrupt, I can't believe we're spending 84% of the time running the >> popf instruction. > > Smells like a software fallback that doesn't do NMI, hrtimer based > sampling typically hits popf where we re-enable interrupts.
Good nose, that's probably it. Raghavendra, can you ensure that the PMU is properly exposed? 'dmesg' in the guest will tell. If it isn't, -cpu host will expose it (and a good idea anyway to get best performance). -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
