git: x86_64 mptable - maximum lapic id is 64
Alex Hornung
ahornung at gmail.com
Sun Jul 29 20:48:32 PDT 2012
On 30 Jul 2012, at 02:46, Sepherosa Ziehau <sepherosa at gmail.com> wrote:
> On Sun, Jul 29, 2012 at 10:59 PM, Alex Hornung
> <alexh at crater.dragonflybsd.org> wrote:
>>
>> commit c81c1e3460b022d0083fcd243e745318f5c04a17
>> Author: Alex Hornung <alex at alexhornung.com>
>> Date: Sun Jul 29 12:00:53 2012 +0000
>>
>> x86_64 mptable - maximum lapic id is 64
>>
>> * In x86_64, lapic ids with HT can be up to 64, not 32 as in i386.
>
> Hmm, are you using MPTABLE to detect CPU topology? I suggest avoid
> using MPTABLE, if possible.
These commits are all about ncpus being wrong on ftigeot's dual xeon machine. The issue resulted in DragonFly not using all the cores/threads, just half of them. It has nothing to do directly with the cpu topology code, which does not use mptable.
Cheers,
Alex
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