Messages in this thread | | | Date | Tue, 18 Jun 2013 07:20:16 +0800 | From | Alex Shi <> | Subject | Re: Performance regression from switching lock to rw-sem for anon-vma tree |
| |
On 06/18/2013 12:22 AM, Davidlohr Bueso wrote: > After a lot of benchmarking, I finally got the ideal results for aim7, > so far: this patch + optimistic spinning with preemption disabled. Just > like optimistic spinning, this patch by itself makes little to no > difference, yet combined is where we actually outperform 3.10-rc5. In > addition, I noticed extra throughput when disabling preemption in > try_optimistic_spin(). > > With i_mmap as a rwsem and these changes I could see performance > benefits for alltests (+14.5%), custom (+17%), disk (+11%), high_systime > (+5%), shared (+15%) and short (+4%), most of them after around 500 > users, for fewer users, it made little to no difference.
A pretty good number. what's the cpu number in your machine? :)
-- Thanks Alex
| |