Messages in this thread | | | From | "David Luyer" <> | Subject | RE: Linux 2.4.19ac3rc3 on IBM x330/x340 SMP - "ps" time skew | Date | Wed, 31 Jul 2002 23:38:41 +1000 |
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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. -- David Luyer Phone: +61 3 9674 7525 Network Development Manager P A C I F I C Fax: +61 3 9699 8693 Pacific Internet (Australia) I N T E R N E T Mobile: +61 4 1111 BYTE http://www.pacific.net.au/ NASDAQ: PCNTF
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