Subject: Re: scheduler woes on MPACPI kernel
To: Teemu Rinta-aho <>
From: Manuel Bouyer <>
List: current-users
Date: 01/18/2005 20:46:38
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.

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference