RE: Linux 2.4.19ac3rc3 on IBM x330/x340 SMP - "ps" time skew

David Luyer (david@luyer.net)
Wed, 31 Jul 2002 23:38:41 +1000

Dana Lacoste wrote:
> On Wed, 2002-07-31 at 13:59, David Luyer wrote:
> > printf("%d\n", sysconf(_SC_NPROCESSORS_CONF));
> > }
> > luyer@praxis8:~$ ./cpus
> > 4
>
> I ran your test program on a Compaq DL360 and an IBM x330
> and both showed '2' for the CPU count (2.4.18 stock, glibc 2.2.3)
>
> Just a point of reference to help narrow the problem area down :)

Yes, the problem is in the -ac train only. It's the "processor id"
field that has been added to /proc/cpuinfo which is confusing libc's
way of counting CPUs.

That's a libc bug. But there's also a kernel bug with that field
it appears.

The kernel bug: the "processor id" fields are both printing zero.

Possibly because show_cpuinfo() in arch/i386/kernel/setup.c prints
directly out of phys_proc_id as at the time it's called, but
smpboot.c declates phys_proc_id as __initdata (either that, or
phys_proc_id is actually zero for both CPUs?).

David.

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