Messages in this thread | | | Date | Wed, 21 Dec 2011 12:43:43 +0200 | From | Avi Kivity <> | Subject | Re: [RFC PATCH 0/4] Gang scheduling in CFS |
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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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