Re: not fixed in 2.4.23-rc3 (was: Re: 2.4.22 SMP kernel build for hyper threading P4)

[William Lee Irwin III]

On Sun, 2003-11-23 at 15:45, Eduard Bloch wrote:
>> #include <hallo.h>
>> * Brown, Len [Sun, Nov 23 2003, 03:16:11PM]:
>> > > weird 1+2xHT mode.

On Mon, Nov 24, 2003 at 01:19:07AM -0500, Len Brown wrote:
> Please try CONFIG_NR_CPUS=8, or apply the patch below to 2.4.23.
> smp_boot_cpus() incorrectly assumes that Local APIC ID's are handed out
> 0,1,2...
> But they're handed out 0,1,6,7 on your system.  #6 happens to be your
> boot CPU, smp_boot_cpus() brings up #0 and #1, and never asks to boot #7
> -- thus 3 logical processors.  If #0 happened to be your boot processor,
> you'd get only 2 logical processors.

A similar (but more elaborate) fix is in 2.6.


-- wli
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