* De: Odhiambo Washington <[EMAIL PROTECTED]> [ Data: 2003-01-28 ]
[ Subjecte: Re: Force 1 CPU on SMP kernel? ]
> * Ceri Davies <[EMAIL PROTECTED]> [20030128 12:50]: wrote:
> > On Mon, Jan 27, 2003 at 11:33:02PM -0500, Adam Migus wrote:
> > > Hi,
> > > I'm doing some performance analysis on FreeBSD. I would like to
> > > be able to make an SMP kernel use only one CPU. Of course I
> > > realize running GENERIC would only use 1 CPU but the concern is
> > > that the overhead assoicated with SMP will skew the statistics.
> > > So my question is what would be the 'best' way to make an SMP
> > > kernel only start/use CPU0?
> >
> > Yank the others ?
> >
>
> What about building two kernels, one SMP, the other non-SMP, then
> just boot wheichever kernel you want? Doesn't it server same purpose?
> Better than Ceri's idea ;)
You're missing the point. He wants to boot only the bootstrap processor,
none of the APs, but still be running an SMP kernel. I think checking how
much overhead "SMP" and "APIC_IO" add is a noble goal, and throwing real
SMP into the mix would be dumb.
--
Juli Mallett <[EMAIL PROTECTED]>
AIM: BSDFlata -- IRC: juli on EFnet
OpenDarwin, Mono, FreeBSD Developer
ircd-hybrid Developer, EFnet addict
FreeBSD on MIPS-Anything on FreeBSD
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