Re: [rfc][patch] store-free path walking

Jens Axboe
2009-10-09T08:55:31Z

On Thu, Oct 08 2009, Nick Piggin wrote:
> This is actualy nice too. My tests were on a 2s8c Barcelona system,
> but this is showing we have a nice serial win on Nehalem as well.
> Actually K8 CPUs have a bit faster lock primitives than earlier
> Intel CPUs I think (closer to Nehalem), so we might see an even
> bigger win with a Core2.

Ran it on another box. This isn't quite a core 2 though, it's a sparc64
(Niagara 2). It has 64 threads, too, but just 8 cores.

2.6.32-rc3 serial
real 0m5.390s
user 0m1.340s
sys 0m2.970s

2.6.32-rc3 parallel
real 0m2.009s
user 0m0.900s
sys 0m2.490s

vfs serial
real 0m4.816s
user 0m1.250s
sys 0m2.270s

vfs parallel
real 0m1.967s
user 0m0.920s
sys 0m1.960s

So it's a win-win there on that platform too.

--
Jens Axboe