Messages in this thread | | | Date | Thu, 09 Oct 2008 17:53:17 +0200 | From | Thomas Hellstrom <> | Subject | Re: AGP PAT issue. |
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Rene Herman wrote: > On 13-09-08 02:26, Pallipadi, Venkatesh wrote: > >>>>> Haven't been subcribed to any lists recently and someone was >>>>> talking about "the other thread" before but just noticed that >>>>> an-rc6 was cut. >>>>> >>>>> Please note that the shutdown issue remains unfixed in it (I'm >>>>> doing my coalescing changes locally). >>>>> >>>> here's what is pending in tip/x86/pat for v2.6.28: >>>> >>> Only talking about .27 and just making sure again the issue is known. >>> >>> The above mentioned subject for the entry cache one ("fix Xorg >>> startup/shutdown slowdown with PAT") after all mistakingly says it >>> does something for shutdown. >>> >> Can you try the patch here >> http://www.ussg.iu.edu/hypermail/linux/kernel/0809.1/2074.html >> >> That should resolve both reserve and free issues.. > > Not for .27 though. > > Rene.
Hi! What's the status on this?
There are graphics devices we're working with that require large (non-AGP) write-combined memory buffers at any time. We can solve the tlb- and cache flush latencies by using pools of these pages to allocate from and free to, but sooner or later we'll probably end up with _huge_ memtype lists. In the (very unlikely) worst case I guess they'd contain every other lowmem page in they system.
If I understand things correctly the patch above will fix this issue? Will it be considered for future kernel inclusion.
Any enlightenment on this subject would be greatly appreciated. Thanks, /Thomas
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