[Cbe-oss-dev] CONFIG_SCHED_SMT

[Benjamin Herrenschmidt]

On Thu, 2007-08-09 at 12:40 +0900, Hiroyuki Machida wrote:
> Hi Geoff and Arnd.
> 
> I'm wondering if it is better to turn on CONFIG_SCHED_SMT or not, in
> Cell B.E. platforms.
> I realized that it's turned off in ps3defconfig, but turned on in
> cell_defconfig.
> I know Cell B.E has SMT but, I'm not sure how CONFIG_SCHED_SMT  works
> with Cell B.E
> in details.

The main question is whether the PS3 arch code properly initializes the
sibling maps ... If yes, then CONFIG_SHED_SMT is a good idea as it will
make the scheduler avoid the second thread unless the primary is full,
though I don't expect that to make much difference on a single core
machine.

Ben