linux-kernel - Re: AGP PAT issue.

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Message-ID: <48C8D731.4000309@keyaccess.nl>
Date:	Thu, 11 Sep 2008 10:30:41 +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: 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.

Rene.
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