RE: AGP PAT issue.

From: Pallipadi, Venkatesh
Date: Fri Sep 12 2008 - 20:29:21 EST

>-----Original Message-----
>From: Rene Herman [mailto:rene.herman@xxxxxxxxxxxx]
>Sent: Thursday, September 11, 2008 1:31 AM
>To: Ingo Molnar
>Cc: Pallipadi, Venkatesh; Dave Airlie; Li, Shaohua; Yinghai
>Lu; Andreas Herrmann; Arjan van de Ven; Linux Kernel; Siddha,
>Suresh B; Thomas Gleixner; H. Peter Anvin; Dave Jones
>Subject: Re: AGP PAT issue.
>On 11-09-08 10:17, Ingo Molnar wrote:
>> * Rene Herman <rene.herman@xxxxxxxxxxxx> wrote:
>>> On 22-08-08 22:02, Rene Herman wrote:
>>>> On 22-08-08 06:15, Ingo Molnar wrote:
>>>>> The frontside cache itself is in x86/urgent:
>>>>> # 80c5e73: x86: fix Xorg startup/shutdown slowdown with PAT
>>>>> ... and should at least solve the symptom that you've hit
>in practice
>>>>> (the slowdown), without changing the underlying PAT
>machinery. (which
>>>>> would be way too dangerous for v2.6.27)
>>>> Well, please note that that specific commit only fixes X
>startup -- it
>>>> doesn't do anything for shutdown. With only that one, I'm
>still at 14
>>>> seconds for X shutdown (first time after boot that is, 5 seconds
>>>> subsequent shutdowns) versus 1 (or sub 1, feels immediate)
>>>> It's also a black-screen "hang", so we'll probably be
>getting a lot of
>>>> "long hang at shutdown" reports without something
>additionally for .27.
>>>> Venki?
>>> 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

That should resolve both reserve and free issues..

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