Fujitsu Siemens TX600 S3 performance issue
John Baldwin
jhb at freebsd.org
Tue Feb 6 17:24:38 UTC 2007
On Tuesday 06 February 2007 03:34, Ludger Bolmerg wrote:
>
> > -----Ursprüngliche Nachricht-----
>
> > > Hi
> > >
> > > I installed FreeBSD 6.2 on a Fujitsu Siemens TX600 S3 with 2 dual core
> > > Xeon processors and 4G RAM.
> > >
> > > The SMP kernel is awfully slow. make buildkernel takes about 6 hours to
> > > complete. When I boot a UP kernel the build completes within 12
> > > minutes. I don't see any unusual message in any log file.
> >
> > Can you run top and see what the system is doing? That sounds very odd. If
> > you boot the SMP kernel with 'kern.smp.disabled=1' set via the loader is it
> > still really slow?
>
> Booting the SMP kernel with kern.smp.disabled=1 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=1
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.
--
John Baldwin
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