[Bug 94722] [SKL/KBL] Init time is high

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94722

--- Comment #21 from David Weinehall <david.weinehall at intel.com> ---
(In reply to Chris Wilson from comment #20)
> (In reply to David Weinehall from comment #19)
> > Measurements using SuspendResume on a KBL-Y yields roughly these numbers:
> > 
> > suspend: 320ms -- out of this 300ms is spent turning off panel + backlight;
> > the delays here cannot be optimised away, so at most we can shave off a few
> > milliseconds. This values will vary greatly depending on the panel used.
> > 
> > resume: 470ms -- out of this 30ms is spent in restore_gtt, 230ms is spent
> > turning on panel + backlight, 170ms on probing for new displays, and 30ms in
> > one of the opregion-related calls.
> 
> Could you test https://patchwork.freedesktop.org/patch/82422/ that should
> help the restore_gtt slightly.

Not just slightly. On my Broadwell it cuts restore_gtt from 15ms to less than
5ms. The Kabylake-Y I've been testing on is busy today -- will run similar
tests on it tomorrow to see whether the savings are similar there.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160511/35ca1c63/attachment-0001.html>