Re: [PATCH] reduce inter-node balancing frequency

[Jesse Barnes <jbarnes@engr.sgi.com>]

On Thursday, July 15, 2004 8:14 pm, Martin J. Bligh wrote:
> > Nick, we've had this patch floating around for awhile now and I'm
> > wondering what you think.  It's needed to boot systems with lots (e.g.
> > 256) nodes, but could probably be done another way.  Do you think we
> > should create a scheduler domain for every 64 nodes or something?
>
> I think that'd make a lot of sense ...

Yeah, though a smaller number of nodes would probably make more sense :)

> > Any other NUMA folks have thoughts about these values?
>
> Yeah, change them in arch specific code, not in the global stuff ;-)

What, you mean we're the only ones with 256 nodes?

> But seeing as they're dependant (for you) on machine size, as well as
> arch type, you probably need to do something cleverer in
> arch_init_sched_domain

Ok, I'll check that out.

> But the big bugaboo is arch-specific vs general ... we need to break
> opteron vs i386 vs ia64 out from each other ... they all need different
> coefficients.
>
> If you were going to be really fancy, we could do it in common code off
> the topology stuff ... but for now, I think it's easier to just set 'em
> per arch ...

We may have enough information to do that already... I'll look.

Thanks,
Jesse