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  • #1786
Closed
Open
Issue created Sep 25, 2019 by Bugzilla Migration User@bugzilla-migration

[GEN9+] 14-24% perf drop in SynMark2 v7 CSDof

Submitted by Eero Tamminen

Assigned to Jason Ekstrand @jekstrand

Link to original bug (#109517)

Description

Mesa performance in SynMark2 v7 CSDof test dropped 24% on SKL GT4e and 14-20% on other GEN9+ platforms.

Setup:

  • Ubuntu 18.04
  • Unity / compiz desktop
  • Mesa from git
  • X server and drm-tip kernel from git within last 1-2 months, with modifier support enabled
  • FullHD monitor

Test-case:

  • synmark2 OglCSDof (configured to run in fullscreen FullHD resolution.)

Regression happened between following commits:

  • 2019-01-28 17:50:08 41a0acd6: Switch imx to kmsro and remove the imx winsys
  • 2019-01-30 17:49:45 f4eb746e: r600: add -Wstrict-overflow=0 to meson to silence the warning

CSDof compute shaders register spill, so a change to register usage (e.g. SENDS support which is GEN9+ specific) is likely cause for the perf regression.

Version: git

See also

  • https://bugs.freedesktop.org/show_bug.cgi?id=110745
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