linux-kernel - Re: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when reasonable

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Date:	Wed, 23 Nov 2011 14:01:54 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Daniel Vetter <daniel@...ll.ch>, rajesh.sankaran@...el.com
Cc:	Keith Packard <keithp@...thp.com>,
	Matthew Garrett <mjg@...hat.com>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when
 reasonable

On Wed, 2011-11-23 at 11:26 +0100, Daniel Vetter wrote:
> On Tue, Nov 22, 2011 at 07:31:34PM -0800, Keith Packard wrote:
> > On Tue, 22 Nov 2011 20:15:31 +0000, Matthew Garrett <mjg@...hat.com> wrote:
> > 
> > > So the user has to choose between 5W of power saving or having dmar? And 
> > > we default to giving them dmar? I think that's going to come as a 
> > > surprise to people.
> > 
> > You'd have to go into the BIOS to turn this on for most machines at
> > least?
> > 
> > But, yeah, it seems like we should be turning DMAR off unless explicitly
> > requested; I can't understand how you'd ever need this running native on
> > the hardware. Not exactly an area I care about deeply; I've always
> > worked hard to make sure all virtualization garbage is disabled on every
> > machine I use.
> 
> Problem is that we need to disable dmar on the entire box, afaics. And I
> assume that a bunch of people abusing desktop boards as servers will call
> "regression" on that.

Hm, do you really have to disable it for the entire box, or just the
graphics?

Do we have a coherent erratum from Intel for the issues mentioned above
with DMAR+gfx+RC6?

Keith, do you know if a sighting has been filed and the hardware folks
are working on it?

Rajesh, are you familiar with this issue?

-- 
dwmw2

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