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SubjectRe: [RFC PATCH 0/4] Gang scheduling in CFS
On 12/21/2011 12:39 PM, Nikunj A Dadhania wrote:
> On Mon, 19 Dec 2011 12:23:26 +0100, Ingo Molnar <mingo@elte.hu> wrote:
> >
> > * Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com> wrote:
> >
> > So could we please approach this from the benchmarked workload
> > angle first? The highest improvement is in ebizzy:
> >
> > > ebizzy 2vm (improved 15 times, i.e. 1520%)
> >
> > What's behind this huge speedup? Does ebizzy use user-space
> > spinlocks perhaps? Could we do something on the user-space side
> > to get a similar speedup?
> >
> This is from the perf run on the host:
>
> Baseline:
>
> 16.22% qemu-kvm [kvm_intel] [k] free_kvm_area
> 8.27% qemu-kvm [kvm] [k] start_apic_timer
> 7.53% qemu-kvm [kvm] [k] kvm_put_guest_fpu
>
> Gang:
>
> 24.44% qemu-kvm [kvm_intel] [k] free_kvm_area
> 13.42% qemu-kvm [kvm] [k] start_apic_timer
> 9.91% qemu-kvm [kvm] [k] kvm_put_guest_fpu
>
> Ingo, Avi, I am not getting anything obvious from this. Any ideas?
>

Looks like perf is confused, this sometimes happens if you rebuild the
kernel but only rmmod/insmod kvm. Try a clean build + boot.

--
error compiling committee.c: too many arguments to function



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