[lkml]   [2009]   [Jul]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] ttm: add pool wc/uc page allocator
On Thu, 2009-07-16 at 18:34 +0200, Jerome Glisse wrote: 
> On Thu, 2009-07-16 at 18:13 +0200, Jerome Glisse wrote:
> > On AGP system we might allocate/free routinely uncached or wc memory,
> > changing page from cached (wb) to uc or wc is very expensive and involves
> > a lot of flushing. To improve performance this allocator use a pool
> > of uc,wc pages.
> >
> > Currently each pool (wc, uc) is 256 pages big, improvement would be
> > to tweak this according to memory pressure so we can give back memory
> > to system.
> >
> > Signed-off-by: Dave Airlie <>
> > Signed-off-by: Jerome Glisse <>
> Just a follow-up on that one, i haven't been able yet to thoroughly
> test this patch on AGP system, so i am mostly sending so other people
> can test. I think i corrected few bugs that were in previous iteration
> of that patch.
> Beside that i think i have addressed all comment previously raisen,
> but don't hesitate to pin point any things i have miss.

This one works a little better on my PowerBook than the previous one:

PCI GART works (failed to allocate the ring buffer before)
AGP fails to allocate the ring buffer (paniced at KMS init before)

Earthling Michel Dänzer |
Libre software enthusiast | Debian, X and DRI developer
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2009-07-17 10:05    [W:0.036 / U:60.984 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site