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
>-----Original Message-----
>From: Thomas Hellstrom [mailto:[email protected]]
>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
Pallipadi, Venkatesh wrote:
>
>> -----Original Message-----
>> From: Thomas Hellstrom [mailto:[email protected]]
>> 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
>
Thanks, Venki.
Much appreciated.
/Thomas