On Tuesday 06 February 2007 03:34, Ludger Bolmerg wrote:
>=20
> > -----Urspr=FCngliche Nachricht-----
>=20
> > > Hi
> > >=20
> > > I installed FreeBSD 6.2 on a Fujitsu Siemens TX600 S3 with 2 dual cor=
e=20
> > > Xeon processors and 4G RAM.
> > >=20
> > > The SMP kernel is awfully slow. make buildkernel takes about 6 hours=
to=20
> > > complete. When I boot a UP kernel the build completes within 12=20
> > > minutes. I don't see any unusual message in any log file.
> >=20
> > Can you run top and see what the system is doing? That sounds very odd=
=2E If=20
> > you boot the SMP kernel with 'kern.smp.disabled=3D1' set via the loader=
is it=20
> > still really slow?
>=20
> Booting the SMP kernel with kern.smp.disabled=3D1 shows good performance =
values.
Ok, can you try leaving SMP enabled but disabling specific cores instead.
You do this via the APIC ID like so:
hint.lapic.10.disabled=3D1
Don't disable the BSP (I think it's ignored), and I would try disabling all
3 AP's at first and then enable the CPUs one a time to compare having 2 CPUs
vs 3 CPUs vs 4 CPUs.
=2D-=20
John Baldwin
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