Dan Malek writes:
> And don't forgetmany applications aren't heavily 'copy-centric' and it
> may be beneficial to not blow away the caches in those cases. That is, if
Using dcbz on the destination won't blow away the caches any more than
doing the copy without dcbz would anyway.
The thing
> Joakim Tjernlund wrote:
>
> > I have been playing with the copy_page() function in arch/ppc/kernel/misc.S
> > and gained about 30% speed up for my mpc860, rev D4 MHz.
>
> Have you found the discussion in linuxppc-dev about the work Paul has done
> on this in general for PowerPC? It may help avo
Joakim Tjernlund wrote:
> I have been playing with the copy_page() function in arch/ppc/kernel/misc.S
> and gained about 30% speed up for my mpc860, rev D4 MHz.
Have you found the discussion in linuxppc-dev about the work Paul has done
on this in general for PowerPC? It may help avoid repeating
Forget the copy_page below. I used a non cache aligned buffer :-(
However if I enable the use of "dcbz" and remove "dcbt" in the
orginal copy_page() and use a cache aligned test buffer,
I still get a speedup of 30% or more on my mpc860 board.
I think a new CONFIG option is apropiate where one ca
> Hi all
>
> I have been playing with the copy_page() function in arch/ppc/kernel/misc.S
> and gained about 30% speed up for my mpc860, rev D4 MHz.
>
> This is what i did:
> - Use dcbz on 8xx but clear ahead one cache line(performance is really crappy
> if I don't clear ahead). This is the bigge
Hi all
I have been playing with the copy_page() function in arch/ppc/kernel/misc.S
and gained about 30% speed up for my mpc860, rev D4 MHz.
This is what i did:
- Use dcbz on 8xx but clear ahead one cache line(performance is really crappy
if I don't clear ahead). This is the biggest improvement
