Messages in this thread | | | From | "Pallipadi, Venkatesh" <> | Date | Mon, 13 Oct 2008 10:10:15 -0700 | Subject | RE: AGP PAT issue. |
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>-----Original Message----- >From: Thomas Hellstrom [mailto:thomas@tungstengraphics.com] >Sent: Thursday, October 09, 2008 8:53 AM >To: Rene Herman >Cc: Pallipadi, Venkatesh; Ingo Molnar; Dave Airlie; Li, >Shaohua; Yinghai Lu; Andreas Herrmann; Arjan van de Ven; Linux >Kernel; Siddha, Suresh B; Thomas Gleixner; H. Peter Anvin; >Dave Jones; Alan Hourihane >Subject: Re: AGP PAT issue. > >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?
This patch is now in upstream git and well on its way to .28
>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.
Yes this patch will help the above case.
Thanks, Venki
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