SMP kernels on single processor machines

Giuliano Pochini pochini at
Fri May 21 20:34:44 EST 2004

On 20-May-2004 Benjamin Herrenschmidt wrote:
> On Thu, 2004-05-20 at 21:48, Lee Braiden wrote:
>> But I quit doing that at some point, after someone (authoritative, but I
>> can't remember the details) pointed out that it added complexity,
>> debugging issues, etc.  Given that I *already* have problems with PPC
>> kernels -- latency/lockups, (preempting?), alsa sound, video res, etc.,
>> I personally wouldn't go near this until I'm fairly confident that the
>> other stuff is solid in its own right.
>> But then, I'm just a luser, not a kernel maintainer ;D
> Yah, well... CONFIG_PREEMPT gives you all the problems of SMP without
> any benefit so .... :)

2.6.6 has the CONFIG_PREEMPT option so I thought it was stable.
Isn't it ?  What are the known problem ?  Is only preempt+smp
known to have problems ?


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