[Vega10] [bisected] Performance regression with Dawn Of War III and RADV

[Deucher, Alexander]

IIRC, this was a dpm bug fix, such that prior to the patch, the mclk would never drop below 500Mhz or something like that and after the fix, it goes down to the lowest frequency.  The dpm heuristics are not a perfect match for some games.


Alex


________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Samuel Pitoiset <samuel.pitoiset at gmail.com>
Sent: Tuesday, August 28, 2018 8:12:12 AM
To: Quan, Evan
Cc: Zhu, Rex; amd-gfx at lists.freedesktop.org
Subject: [Vega10] [bisected] Performance regression with Dawn Of War III and RADV

Hi there,

I found a performance regression that affects my Vega10 with Dawn Of War
III and RADV (ie. 74FPS -> 71FPS). I bisected to:

commit ea7f492b6ac6eced0d09ccb2b0a2909a0025e22e
Author: Evan Quan <evan.quan at amd.com>
Date:   Mon Jul 16 17:23:19 2018 +0800

     drm/amd/powerplay: correct the argument for PPSMC_MSG_SetUclkFastSwitch

     The argument was set wrongly. Fast/slow switch was asked when there is
     actually a slow/fast switch needed.

     Change-Id: Ibcfdf741dea1700cc3796f84291606231e732f4b
     Signed-off-by: Evan Quan <evan.quan at amd.com>
     Reviewed-by: Rex Zhu<rex.zhu at amd.com>

Any ideas?

Thanks,
Samuel.
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