Peter Zijlstra wrote:
On Tue, 2007-08-21 at 16:05 +1000, Dave Airlie wrote:
So you can see why some sort of uncached+writecombined page cache
would be useful, I could just allocate a bunch of pages at startup as
uncached+writecombined, and allocate pixmaps from them and when I
bind/free the pi
There is an uncached allocator in IA64 arch code
(linux/arch/ia64/kernel/uncached.c). Maybe having a look at
that will help? Jes wrote it.
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On Tue, 2007-08-21 at 16:05 +1000, Dave Airlie wrote:
> So you can see why some sort of uncached+writecombined page cache
> would be useful, I could just allocate a bunch of pages at startup as
> uncached+writecombined, and allocate pixmaps from them and when I
> bind/free the pixmap I don't need
> Blame intel ;)
>
> > Any other ideas and suggestions?
>
> Without knowing exactly what you are doing:
>
> - Copies to uncached memory are very expensive on an x86 processor
> (so it might be faster not to write and flush)
> - Its not clear from your description how intelligent your transfer
> sys
>
> Write-combining access seems the correct thing here, followed by a
> wmb(). Uncached writing would be horrendously slow.
>
> [snip]
> > So after all that I'd like to have some sort of uncached page list I
> > can allocate pages from
>
> This is exactly what Intel's PAT mechanism exists for - ju
On 20 Aug, 01:50, "Dave Airlie" <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> I've started doing some work with using the new DRM memory manager
> from TG for pixmaps in the X server using Intel 9xx series hardware.
>
> The intel hardware pretty much requires pages to be uncached for the
> GPU to access
> allocate pixmap gets cached memory
> copy data into the pixmap
> pre-use from hardware we flush the cache lines and tlb
> use the pixmap in hardware
> pre-free we need to set the page back to cached so we flush the tlb
> free the memory.
> Now the big issue here on SMP is that the cache and/or t
Hi all,
I've started doing some work with using the new DRM memory manager
from TG for pixmaps in the X server using Intel 9xx series hardware.
The intel hardware pretty much requires pages to be uncached for the
GPU to access them. It can use cached memory for some operations but
it isn't very u
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