Subject: Re: tuning for small memory machines
To: Brian Chase <vaxzilla@jarai.org>
From: Perry E. Metzger <perry@piermont.com>
List: tech-kern
Date: 11/29/2002 17:03:19
Brian Chase <vaxzilla@jarai.org> writes:
> For my test, I compiled two identical kernels. I used the `time'
> command to time the compiles.
>
> With the default vm.anonmax=80, the `make netbsd' time is as follows:
> 16479.544u 996.689s 4:59:27.65 97.2% 0+0k 141+9374io 754pf+76w
>
> And by setting vm.anonmax=95, the `make netbsd' time is:
> 16487.698u 991.133s 4:59:23.60 97.3% 0+0k 154+9285io 723pf+78w
>
> I was astonished with how close the results were, and obviously a bit
> disappointed to not see any gains. Maybe there are none to be had
> with my whopping 12MB of available memory? :-)
It hardly seems surprising at all. I doubt you could get to 95% use by
anon on a 12M machine -- where would files and program text end up?
On a larger memory machine, I doubt it would improve performance
either. anonmax of 95 seems very silly to me actually...
--
Perry E. Metzger perry@piermont.com