Re: io resources and cached mappings (was: [git pull] drm patches
for 2.6.27-rc1)
[Posted November 4, 2008 by corbet]
| 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,
Thread
|
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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