Messages in this thread | | | Subject | Re: [LKP] [drm/mgag200] 90f479ae51: vm-scalability.median -18.8% regression | From | Rong Chen <> | Date | Wed, 28 Aug 2019 17:37:01 +0800 |
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Hi Thomas,
On 8/28/19 1:16 AM, Thomas Zimmermann wrote: > Hi > > Am 27.08.19 um 14:33 schrieb Chen, Rong A: >> Both patches have little impact on the performance from our side. > Thanks for testing. Too bad they doesn't solve the issue. > > There's another patch attached. Could you please tests this as well? > Thanks a lot! > > The patch comes from Daniel Vetter after discussing the problem on IRC. > The idea of the patch is that the old mgag200 code might display much > less frames that the generic code, because mgag200 only prints from > non-atomic context. If we simulate this with the generic code, we should > see roughly the original performance. > >
It's cool, the patch "usecansleep.patch" can fix the issue.
commit: f1f8555dfb9 drm/bochs: Use shadow buffer for bochs framebuffer console 90f479ae51a drm/mgag200: Replace struct mga_fbdev with generic framebuffer emulation b976b04c2bc only schedule worker from non-atomic context
f1f8555dfb9a70a2 90f479ae51afa45efab97afdde b976b04c2bcf33148d6c7bc1a2 testcase/testparams/testbox ---------------- -------------------------- -------------------------- --------------------------- %stddev change %stddev change %stddev \ | \ | \ 42912 -15% 36517 44093 vm-scalability/performance-300s-8T-anon-cow-seq-hugetlb/lkp-knm01 42912 -15% 36517 44093 GEO-MEAN vm-scalability.median
Best Regards, Rong Chen
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