linux-kernel - Re: AGP PAT issue.

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Date:	Thu, 09 Oct 2008 17:53:17 +0200
From:	Thomas Hellstrom <thomas@...gstengraphics.com>
To:	Rene Herman <rene.herman@...access.nl>
CC:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Ingo Molnar <mingo@...e.hu>, 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>,
	Alan Hourihane <alanh@...gstengraphics.com>
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?

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.

Any enlightenment on this subject would be greatly appreciated.
Thanks,
/Thomas



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