linux-kernel - Re: io resources and cached mappings (was: [git pull] drm patches for 2.6.27-rc1)

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Date:	Mon, 3 Nov 2008 11:48:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dave Airlie <airlied@...il.com>
Cc:	Keith Packard <keithp@...thp.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Airlie <airlied@...ux.ie>,
	Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: io resources and cached mappings (was: [git pull] drm patches
	for 2.6.27-rc1)


* Dave Airlie <airlied@...il.com> wrote:

> On Fri, Oct 24, 2008 at 1:39 AM, Keith Packard <keithp@...thp.com> wrote:
> > On Thu, 2008-10-23 at 10:05 +0200, Ingo Molnar wrote:
> >
> >> Any ballpark-figure numbers you can share with us?
> >
> > For one quake-3 based game we use for performance regression checking,
> > 64-bit kernels run about 18 times faster now. That's the difference
> > between using a zero-cost dynamic mapping and using ioremap_wc for each
> > page.
> >
> > --
> > keith.packard@...el.com
> >
> 
> So I've put these patches into Fedora rawhide kernel to test, and 
> glxgears on my 945G hw went from 85fps to 380fps, clearly we would 
> want these patches upstream sooner rather than later.

yep, it's all lined up already in tip/core/resources, and got 
massively tested over the past few days. Will send a pull request to 
Linus tomorrow-ish - we need one final cleanup patch and then it's 
green to go.

	Ingo
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