Re: UP Regression (was) Re: Scaling noise

[Nick Piggin]

Cliff White wrote:

> [snip]
> .
>
> > I don't think anyone advocates sacrificing UP performance for 32 ways, but
> > as he says it can happen .1% at a time.
> >
> > But it looks like 2.6 will scale well to 16 way and higher. I wonder if
> > there are many regressions from 2.4 or 2.2 on small systems.
> On the Scalable Test Platform, running osdl-aim-7,  for the
> UP case, 2.4 is a bit better than 2.6, this is consistent across
> many runs. For SMP, 2.6 is better, but the delta is rather
> small, until we get to 8 CPUS. We have a lot of un-parsed data from other
> tests - might be some trends there also.
> See http://developer.osdl.org/cliffw/reaim/index.html 
> 2.4 kernels are at the bottom of the page.

Forgive my ignorance of your benchmarks, but this might very well
be HZ == 1000?


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