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[0/3] drm/i915/gt: RPS tuning for light media playback

Message ID 20211117224955.28999-1-vinay.belgaumkar@intel.com (mailing list archive)
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Series drm/i915/gt: RPS tuning for light media playback | expand

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Vinay Belgaumkar Nov. 17, 2021, 10:49 p.m. UTC 
Switch from tgl to adl, sees one particular media decode pipeline fit
into a single vcs engine on adl, whereas it took two on tgl. However, it
was observed that the power consumtpion for adl remained higher than for
tgl. One contibution is that each engine is treated individually for rps
evaluation, another is that it appears that we prefer to avoid low
frequencies (with no rc6) and use slightly higher frequencies (with lots
of rc6). So let's try tweaking the balancer to smear busy virtual
contexts across multiple engines (trying to make adl look more like
tgl), and tweak the rps evaluation to "race to idle" harder.

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

Chris Wilson (3):
  drm/i915/gt: Spread virtual engines over idle engines
  drm/i915/gt: Compare average group occupancy for RPS evaluation
  drm/i915/gt: Improve "race-to-idle" at low frequencies

 .../drm/i915/gt/intel_execlists_submission.c  | 80 ++++++++++++-------
 drivers/gpu/drm/i915/gt/intel_rps.c           | 79 +++++++++++++-----
 2 files changed, 112 insertions(+), 47 deletions(-)