Le lun 10/04/2006 à 10:24, Andrew Morton a écrit :
> Laurent Vivier <Laurent.Vivier@xxxxxxxx> wrote:
> >
> > Does the attached patch look like the thing you though about ?
>
> I guess so. But it'll need a lot of performance testing on big SMP
> to work out what the impact is.
I made some tests with dbench:
IBM x440: 8 CPUs hyperthreaded = 16 CPUs (Xeon at 1.4 Ghz)
with percpu_counter:
Throughput 188.365 MB/sec 16 procs
Throughput 226.164 MB/sec 32 procs
Throughput 142.913 MB/sec 64 procs
with atomic_long_t:
Throughput 194.385 MB/sec 16 procs
Throughput 237.273 MB/sec 32 procs
Throughput 160.751 MB/sec 64 procs
Regards,
Laurent
--
Laurent Vivier
Bull, Architect of an Open World (TM)
http://www.bullopensource.org/ext4
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