Re: AGP PAT issue.

[Thomas Hellström]

Pallipadi, Venkatesh wrote:
>   
> > -----Original Message-----
> > From: Thomas Hellstrom [mailto:thomas@xxxxxxxxxxxxxxxxxxxx]
> > 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



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/