Hi Am 28.08.19 um 11:37 schrieb Rong Chen: > 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. Thank you for testing. But don't get too excited, because the patch simulates a bug that was present in the original mgag200 code. A significant number of frames are simply skipped. That is apparently the reason why it's faster. Best regards Thomas > 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 > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Thomas Zimmermann Graphics Driver Developer SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany GF: Felix Imendörffer, Mary Higgins, Sri Rasiah HRB 21284 (AG Nürnberg)
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