[dm-devel] [PATCH v2 1/1] dm-raid45

[Dan Williams]

On Wed, Dec 9, 2009 at 10:47 AM, Heinz Mauelshagen <heinzm at redhat.com> wrote:
> On Tue, 2009-12-08 at 17:38 -0700, Dan Williams wrote:
>> On Thu, Nov 26, 2009 at 6:45 AM,  <heinzm at redhat.com> wrote:
>> > From: Heinz Mauelshagen <heinzm at redhat.com>
>> >
>> > Neil et al.,
>> >
>> > finally got around to creating a followup (interim) patch, which allows
>> > for changing the xor algorithn at runtime via the message interface,
>> > hence allowing to test if the xor unrole optimization around the
>> > supported algorithms is performing better than the assembler
>> > optimized one in the kernel.
>>
>> Now that perf is available it would be good to get some comparative
>> cache utilization statistics on the two approaches.
>
> I'd appreciate it.
> Do you have any time to spend on this comparison ?
>

I can give it a shot.  The easiest way to test would be to export your
versions via a struct xor_block_template.  However, the question I
have is how do your macros differ from the existing ones in
include/asm-generic/xor.h?  Can we achieve the same effect by
extending the ones in include/asm-generic/xor.h to do up to 8 at a
time?

Thanks,
Dan