linux-kernel - RE: AGP PAT issue.

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Date:	Mon, 13 Oct 2008 10:10:15 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Thomas Hellstrom <thomas@...gstengraphics.com>,
	Rene Herman <rene.herman@...access.nl>
CC:	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.



>-----Original Message-----
>From: Thomas Hellstrom [mailto:thomas@...gstengraphics.com]
>Sent: Thursday, October 09, 2008 8:53 AM
>To: Rene Herman
>Cc: Pallipadi, Venkatesh; Ingo Molnar; Dave Airlie; Li,
>Shaohua; Yinghai Lu; Andreas Herrmann; Arjan van de Ven; Linux
>Kernel; Siddha, Suresh B; Thomas Gleixner; H. Peter Anvin;
>Dave Jones; Alan Hourihane
>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?

This patch is now in upstream git and well on its way to .28

>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.

Yes this patch will help the above case.

Thanks,
Venki
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