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

From:  Keith Packard <keithp-AT-keithp.com>
To:  Ingo Molnar <mingo-AT-elte.hu>
Subject:  Re: io resources and cached mappings (was: [git pull] drm patches for 2.6.27-rc1)
Date:  Thu, 23 Oct 2008 08:39:10 -0700
Message-ID:  <1224776350.6738.14.camel@koto.keithp.com>
Cc:  keithp-AT-keithp.com, Jesse Barnes <jbarnes-AT-virtuousgeek.org>, Nick Piggin <nickpiggin-AT-yahoo.com.au>, Dave Airlie <airlied-AT-linux.ie>, Yinghai Lu <yinghai-AT-kernel.org>, Linux Kernel Mailing List <linux-kernel-AT-vger.kernel.org>
Archive-link:  Article

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@intel.com



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