Re: isolcpus weirdness

Con Kolivas
2006-02-23T10:01:01Z

On Thursday 23 February 2006 20:55, Emmanuel Pacaud wrote:
> Le mercredi 22 fÃ©vrier 2006 Ã  22:18 +0100, Frederik Deweerdt a Ã©crit :
> > On Wed, Feb 22, 2006 at 02:21:27PM +0100, Emmanuel Pacaud wrote:
> > > What's wrong ?
> >
> > Are you able to reproduce the same behaviour after disabling HT in
> > the kernel config?
>
> I think HT is disabled in kernel config, since I only see 2 cpus.
>
> In fact, I've tried to enable HT, but did'nt succeed. HT is enabled in
> BIOS, but I'm not sure about exact things I must set at kernel config
> level for hyperthreading. I've tried to set/unset CONFIG_SCHED_SMT, but
> that changes nothing (no hyperthreading, isolated cpu is always cpu0).
>
> Here's attached my config file.

CONFIG_ACPI is not set

You need ACPI to enumerate hyperthread siblings. That's why HT never gets
enabled for you.

Cheers,
Con