"Michael S. Tsirkin" <[EMAIL PROTECTED]> writes:
>> So in general the pci prefetchable attribute means write-combining as
>> well as prefetching is safe. A sane BIOS will allocate prefetchable
>> BARS contiguously in the address space. So on a good day you
>> can just use one MTRR to map all of
> So in general the pci prefetchable attribute means write-combining as
> well as prefetching is safe. A sane BIOS will allocate prefetchable
> BARS contiguously in the address space. So on a good day you
> can just use one MTRR to map all of the prefetchable BARs as write-combining.
Good point,
On Wednesday 25 April 2007 20:41:08 Dave Jones wrote:
> On Wed, Apr 25, 2007 at 08:19:27PM +0200, Andi Kleen wrote:
> > On Wednesday 25 April 2007 20:02:26 Roland Dreier wrote:
> > > Hi Eric,
> > >
> > > Where do your patches to add an implementation of
> > > pgprot_writecombine() using PATs
Roland Dreier <[EMAIL PROTECTED]> writes:
> > Roland is the mlx4 sane enough to put the memory that needs
> > write-combining a prefetchable bar. So several cards can be combined
> > together?
>
> Yes, it is in a prefetchable BAR. It's the second half of the second
> BAR in:
>
> 0d:00.0 I
On Wed, Apr 25, 2007 at 08:19:27PM +0200, Andi Kleen wrote:
> On Wednesday 25 April 2007 20:02:26 Roland Dreier wrote:
> > Hi Eric,
> >
> > Where do your patches to add an implementation of
> > pgprot_writecombine() using PATs on x86 stand?
>
> It's on my todo list.
Whats the status on
Andi Kleen <[EMAIL PROTECTED]> writes:
> On Wednesday 25 April 2007 20:02:26 Roland Dreier wrote:
>> Hi Eric,
>>
>> Where do your patches to add an implementation of
>> pgprot_writecombine() using PATs on x86 stand?
>
> It's on my todo list.
Basically enabling PAT is easy. Adding the paranoid
> Roland is the mlx4 sane enough to put the memory that needs
> write-combining a prefetchable bar. So several cards can be combined
> together?
Yes, it is in a prefetchable BAR. It's the second half of the second
BAR in:
0d:00.0 InfiniBand: Mellanox Technologies Unknown device 634a (rev
> > Where do your patches to add an implementation of
> > pgprot_writecombine() using PATs on x86 stand?
>
> It's on my todo list.
Great. Let me know if there's anything I can do to help.
> When it's PCI space you can likely just use MTRRs. PAT is mostly useful
> for applications that d
On Wednesday 25 April 2007 20:02:26 Roland Dreier wrote:
> Hi Eric,
>
> Where do your patches to add an implementation of
> pgprot_writecombine() using PATs on x86 stand?
It's on my todo list.
> The mlx4 driver I'm
> planning on merging for 2.6.22 would really like writecombining, and
> I'm i
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