Messages in this thread |  | | Date | Tue, 5 Nov 2013 11:10:43 +0800 | From | Yuanhan Liu <> | Subject | Re: [PATCH 0/4] per anon_vma lock and turn anon_vma rwsem lock to rwlock_t |
| |
On Mon, Nov 04, 2013 at 05:44:00PM -0800, Tim Chen wrote: > On Mon, 2013-11-04 at 11:59 +0800, Yuanhan Liu wrote: > > On Fri, Nov 01, 2013 at 08:15:13PM -0700, Davidlohr Bueso wrote: > > > On Fri, 2013-11-01 at 18:16 +0800, Yuanhan Liu wrote: > > > > On Fri, Nov 01, 2013 at 09:21:46AM +0100, Ingo Molnar wrote: > > > > > > > > > > * Yuanhan Liu <yuanhan.liu@linux.intel.com> wrote: > > > > > > > > > > > > Btw., another _really_ interesting comparison would be against > > > > > > > the latest rwsem patches. Mind doing such a comparison? > > > > > > > > > > > > Sure. Where can I get it? Are they on some git tree? > > > > > > > > > > I've Cc:-ed Tim Chen who might be able to point you to the latest > > > > > version. > > > > > > > > > > The last on-lkml submission was in this thread: > > > > > > > > > > Subject: [PATCH v8 0/9] rwsem performance optimizations > > > > > > > > > > > > > Thanks. > > > > > > > > I queued bunchs of tests about one hour ago, and already got some > > > > results(If necessary, I can add more data tomorrow when those tests are > > > > finished): > > > > > > What kind of system are you using to run these workloads on? > > > > I queued jobs on 5 testboxes: > > - brickland1: 120 core Ivybridge server > > - lkp-ib03: 48 core Ivybridge server > > - lkp-sb03: 32 core Sandybridge server > > - lkp-nex04: 64 core NHM server > > - lkp-a04: Atom server > > > > > > > > > > > > > > > v3.12-rc7 fe001e3de090e179f95d > > > > ------------------------ ------------------------ > > > > -9.3% brickland1/micro/aim7/shared > > > > +4.3% lkp-ib03/micro/aim7/fork_test > > > > +2.2% lkp-ib03/micro/aim7/shared > > > > -2.6% TOTAL aim7.2000.jobs-per-min > > > > > > > > > > Sorry if I'm missing something, but could you elaborate more on what > > > these percentages represent? > > > > v3.12-rc7 fe001e3de090e179f95d > > ------------------------ ------------------------ > > -9.3% brickland1/micro/aim7/shared > > .... > > .... > > -2.6% TOTAL aim7.2000.jobs-per-min > > > > The comparation base is v3.12-rc7, and we got 9.3 performance regression > > at commit fe001e3de090e179f95d, which is the head of rwsem performance > > optimizations patch set. > > Yunahan, thanks for the data. This I assume is with the entire rwsem > v8 patchset.
Yes, it is; 9 patches in total.
> Any idea of the run variation on the workload?
Your concern is right. The variation is quite big on the brickland1/micro/aim7/shared testcase.
* - v3.12-rc7 O - fe001e3de090e179f95d
brickland1/micro/aim7/shared: aim7.2000.jobs-per-min
320000 ++----------------------------------------------------------------+ | | 310000 ++ .*......... | | .... ....... | 300000 ++ .... ....... | | ... ...... | 290000 ++ .... ...| | .... * 280000 ++ ... | | .... | 270000 ++.... | *. O 260000 O+ | | O | 250000 ++----------------------------------------------------------------+
--yliu > > > > "brickland1/micro/aim7/shared" tells the testbox(brickland1) and testcase: > > shared workfile of aim7. > > > > The last line tell what field we are comparing, and it's > > "aim7.2000.jobs-per-min" in this case. 2000 means 2000 users in aim7. > > > > > Are they anon vma rwsem + optimistic > > > spinning patches vs anon vma rwlock? > > > > I tested "[PATCH v8 0/9] rwsem performance optimizations" only. > > > > > > > > Also, I see your running aim7, you might be interested in some of the > > > results I found when trying out Ingo's rwlock conversion patch on a > > > largish 80 core system: https://lkml.org/lkml/2013/9/29/280 > > > > Besides aim7, I also tested dbench, hackbench, netperf, pigz. And as you > > can image and see from the data, aim7 benifit most from the anon_vma > > optimization stuff due to high contention of anon_vma lock. > > > > Thanks. > > > > --yliu > > >
|  |