linux-kernel - RE: AGP PAT issue.

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Date:	Fri, 12 Sep 2008 17:26:47 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Rene Herman <rene.herman@...access.nl>, Ingo Molnar <mingo@...e.hu>
CC:	Dave Airlie <airlied@...il.com>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Dave Jones <davej@...emonkey.org.uk>
Subject: RE: AGP PAT issue.



>-----Original Message-----
>From: Rene Herman [mailto:rene.herman@...access.nl]
>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@...access.nl> 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)
>normally.
>>>>
>>>> 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
http://www.ussg.iu.edu/hypermail/linux/kernel/0809.1/2074.html

That should resolve both reserve and free issues..

Thanks,
Venki
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