linux-kernel - AGP PAT issue.

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Date:	Wed, 10 Sep 2008 21:52:59 +0200
From:	Rene Herman <rene.herman@...access.nl>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	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: AGP PAT issue.

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).

Rene
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