Messages in this thread | | | Date | Mon, 13 Oct 2008 21:26:22 +0200 | From | Thomas Hellström <> | Subject | Re: AGP PAT issue. |
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Pallipadi, Venkatesh wrote: > >> -----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 > Thanks, Venki. Much appreciated.
/Thomas
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