On Thu, Aug 16, 2012 at 08:27:15AM +0200, Markus F.X.J. Oberhumer wrote:

On 2012-08-15 16:45, Johannes Stezenbach wrote:

quoted

I made the attached quick hack userspace code
using ARM kernel headers and barebox unlzop code.
(new == your new code, old == linux-3.5 git, test == new + your suggested change)
(sorry I had no time to clean it up)

My suggested COPY4 replacement probably has a lot of load stalls - maybe some
ARM expert could have a look and suggest a more efficient implementation.

In any case, I still would like to see the new code in linux-next because
of the huge improvements on other modern CPUs.

Well, ~2x speedup on x86 is certainly a good achievement, but there
are more ARM based devices than there are PCs, and I guess many
embedded devices use lzo compressed kernels and file systems
while I'm not convinced many PCs rely on lzo in the kernel.

I know everyone's either busy or on vacation, but it would
be so cool if someone could test on a more modern ARM core,
with the userspace test code I posted it should be easy to do.


Johannes