Re: Odd sched behaviour; It takes 5 threads or more to load 2 CPU cores during kernel build

[Jesper Juhl]

On 2/28/06, Christian <christiand59@xxxxxx> wrote:
> Am Dienstag, 28. Februar 2006 20:59 schrieb Jesper Juhl:
[snip]
> >
> > Do we have a scheduler problem?
> > An io-scheduler problem?
>
> I'm not really into this, but what happens if you simply start 5 different
> kernel-builds in parallel? I think if it makes a difference then this would
> mean that there's something wrong with make and you could eliminate the first
> two possibilities?!
>

Well, no need for 5 kernel builds in that case.
If I clone my source tree and then simply run
 $ make distclean ; make allnoconfig ; nice make
in each directory in two different shells at the same time, then both
cores get fully loaded.


> > Is it "make" that's being difficult?
> > Is it something in the kernels Makefile that causes the build to
> > behave this way?
> > Could it be a bottleneck in my system somewhere?
> >
> > Anyone got a clue?
> >


--
Jesper Juhl <jesper.juhl@xxxxxxxxx>
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