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author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-03-25 17:39:12 -0700 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-03-26 22:23:41 +0100 |
commit | d546b67a940eb42a99f56b86c5cd8d47c8348c2a (patch) | |
tree | 5382b2d1800756aedad0a25643081de2eec6a4bf /include/asm-sparc64 | |
parent | 76c324182bbd29dfe4298ca65efb15be18055df1 (diff) |
x86: fix performance drop for glx
fix the 3D performance drop reported at:
http://bugzilla.kernel.org/show_bug.cgi?id=10328
fb drivers are using ioremap()/ioremap_nocache(), followed by mtrr_add with
WC attribute. Recent changes in page attribute code made both
ioremap()/ioremap_nocache() mappings as UC (instead of previous UC-). This
breaks the graphics performance, as the effective memory type is UC instead
of expected WC.
The correct way to fix this is to add ioremap_wc() (which uses UC- in the
absence of PAT kernel support and WC with PAT) and change all the
fb drivers to use this new ioremap_wc() API.
We can take this correct and longer route for post 2.6.25. For now,
revert back to the UC- behavior for ioremap/ioremap_nocache.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-sparc64')
0 files changed, 0 insertions, 0 deletions