On Tue, 18 Jan 2005, Manuel Bouyer wrote:

> On Tue, Jan 18, 2005 at 05:09:48PM +0200, Teemu Rinta-aho wrote:
>> Does anyone know if there has been any analysis on the
>> effect of P4 hyperthreading and MP support of NetBSD,
>> compared to a UP kernel?
>
> I tested with a make -j4 kernel build. A few % improvements with a MP kernel.
> But this is because we have a big kernel lock I think. On linux 2.6, which
> has finer-grained locking, a MP kernel increased the build time instead of
> decreasing it.

Huh? I didn't understand this...
Are you claiming that a finer grained lock will decrease performance? Or 
is there a serious bug in the Linux kernel?

 	Johnny

Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt@update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol