Re: [PATCH 0/3] NUMA boot hash allocation interleaving

Jose R. Santos
2004-12-23T02:20:11Z

Brent Casavant <bcasavan@sgi.com> [041221]:
> I didn't realize this was ppc64 testing. What was the exact setup
> for the testing? The patch as posted (and I hope clearly explained)
> only turns on the behavior by default when both CONFIG_NUMA and
> CONFIG_IA64 were active. It could be activated on non-IA64 by setting
> hashdist=1 on the boot line, or by modifying the patch.

I wasn't aware of the little detail. I re-tested with hashdist=1 and
this time it shows a slowdown of about 3%-4% on a 4-Way Power5 system
(2 NUMA nodes) with 64GB. Don't see a big problem if the things is off
by default on non IA64 systems though.

> I would hate to find out that the testing didn't actually enable the
> new behavior.

Serves me right for not reading the entire thread. :)

-JRS