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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