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From: "Szwichtenberg, Radoslaw" <radoslaw.szwichtenberg@intel.com>
To: "intel-gfx@lists.freedesktop.org"
	<intel-gfx@lists.freedesktop.org>,
	"chris@chris-wilson.co.uk" <chris@chris-wilson.co.uk>
Cc: "Maarten@freedesktop.org" <Maarten@freedesktop.org>
Subject: Re: [PATCH] drm/i915: Boost GPU clocks if we miss the pageflip's vblank
Date: Fri, 18 Aug 2017 08:50:35 +0000	[thread overview]
Message-ID: <1503046232.3082.0.camel@intel.com> (raw)
In-Reply-To: <150304287114.1452.3636705851698225805@mail.alporthouse.com>

On Fri, 2017-08-18 at 08:54 +0100, Chris Wilson wrote:
> Quoting Chris Wilson (2017-08-17 13:37:06)
> > If we miss the current vblank because the gpu was busy, that may cause a
> > jitter as the frame rate temporarily drops. We try to limit the impact
> > of this by then boosting the GPU clock to deliver the frame as quickly
> > as possible. Originally done in commit 6ad790c0f5ac ("drm/i915: Boost GPU
> > frequency if we detect outstanding pageflips") but was never forward
> > ported to atomic and finally dropped in commit fd3a40242e87 ("drm/i915:
> > Rip out legacy page_flip completion/irq handling").
> 
>  
> > References: https://bugs.freedesktop.org/show_bug.cgi?id=102199
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102199
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > Cc: Daniel Vetter <daniel.vetter@intel.com>
> 
> Tested-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Radoslaw Szwichtenberg <radoslaw.szwichtenberg@intel.com>
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  reply	other threads:[~2017-08-18  8:50 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-17 12:37 [PATCH] drm/i915: Boost GPU clocks if we miss the pageflip's vblank Chris Wilson
2017-08-17 13:11 ` ✗ Fi.CI.BAT: failure for " Patchwork
2017-08-18  7:54 ` [PATCH] " Chris Wilson
2017-08-18  8:50   ` Szwichtenberg, Radoslaw [this message]
2017-08-22 16:11     ` Chris Wilson
2017-08-18  9:30 ` Chris Wilson
2017-08-18 14:05   ` Chris Wilson
2017-08-21 15:54 ` Chris Wilson
2017-08-22 17:02   ` Ville Syrjälä
2017-08-22 17:12     ` Chris Wilson

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