Re: [PATCH] change global zonelist order on NUMA v2

Andi Kleen
2007-04-26T09:47:49Z

On Thursday 26 April 2007 11:34:17 KAMEZAWA Hiroyuki wrote:
>
> Changelog from V1 -> V2
> - sysctl name is changed to be relaxed_zone_order
> - NORMAL->NORMAL->....->DMA->DMA->DMA order (new ordering) is now default.
> NORMAL->DMA->NORMAL->DMA order (old ordering) is optional.
> - addes boot opttion to set relaxed_zone_order. ia64 is supported now.
> - Added documentation
>
> patch is against 2.6.21-rc7-mm2. tested on ia64 NUMA box. works well.

IMHO the change should be default (without any options) unless someone
can come up with a good reason why not. On x86-64 it should be definitely
default.

If there is a good reason on some architecture or machine a user option is also not a
good idea, but instead it should be set automatically by that architecture or machine
on boot.

-Andi