Re: Spinlocks, yet again: analysis and proposed patches

On Sat, 17 Sep 2005, Tom Lane wrote:

> Stephen Frost <sfrost(at)snowman(dot)net> writes:
> > * Greg Stark (gsstark(at)mit(dot)edu) wrote:
> >> However I was under the impression that 2.6 had moved beyond that problem.
> >> It would be very interesting to know if 2.6 still suffers from this.
>
> > The tests on the em64t at my place were using 2.6.12. I had thought 2.6
> > was better about this too, but I don't have another explanation for it.
>
> The 4-way Opteron I've been using at Red Hat is running
> 2.6.12-1.1398_FC4smp (Fedora Core 4 obviously). Red Hat in particular
> has been working hard in this area, and I thought that their recent
> kernels included NUMA fixes that weren't yet accepted upstream (at least
> not in the stable kernel branches). But it seems there's still a ways
> to go yet.
>
> It'd be real interesting to see comparable numbers from some non-Linux
> kernels, particularly commercial systems like Solaris.

Did you see the Solaris results I posted?

Gavin