Messages in this thread | | | From | Nikunj A Dadhania <> | Subject | Re: [RFC PATCH 0/4] Gang scheduling in CFS | Date | Wed, 21 Dec 2011 16:09:36 +0530 |
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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?
Regards Nikunj
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