[ILUG] SMP

[Thomas Bridge]

On Mon, 9 Aug 1999, Vincent Cunniffe wrote:

> I just upgraded my machine to an SMP system over the weekend, using
> dual Celerons on a BP6 motherboard. Linux runs perfectly happily
> on it, unless I'm compiling the kernel, which is rather odd. I know
> the kernel compile is one of the most stressful things you can do
> to the compiler, but getting sig11's *only* during the kernel compile
> is a little odd.
 
> The Celerons in question are 366's, overclocked to 550. They're
> perfectly stable and running cool (as in temperature :-), and run
> without any problems.
 
> The odd thing is that I can compile a kernel perfectly well, using 
> the same CPU's at the same speed, when compiling *from* a non-SMP
> kernel. When I boot to an SMP aware kernel and try re-compiling the
> kernel, it fails with sig11's after a while (it does however manage
> to compile a good few files first.)
 
> I'll drop the CPU's back to the rated 366 this evening and try an
> SMP compile again, but in the meantime I was wondering if anyone else
> out there has experience of this type of error, and any general
> advice about SMP problems, recompiling apps for SMP use, etc., etc.

I don't think this has anything to do with this problem, but if you're
compiling a kernel under an SMP kernel, you should edit
/usr/src/linux/Makefile and change the make line to:

make	=make -jN

where N is the number of CPUs in the machine + 1.   This will make the
kernel compile slightly faster.

T.

-- 
Thomas Bridge			Hostmaster/Sysadmin, Medianet Ireland.
thomas.bridge at medianet.ie
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