Re: Fujitsu Siemens TX600 S3 performance issue

On Wednesday 07 February 2007 08:45, Ludger Bolmerg wrote:
> 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=
=20
core=20
> > > > > Xeon processors and 4G RAM.
> > > > >=20
> > > > > The SMP kernel is awfully slow.  make buildkernel takes about 6=20
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=
=20
odd.  If=20
> > > > you boot the SMP kernel with 'kern.smp.disabled=3D1' set via the lo=
ader=20
is it=20
> > > > still really slow?
> > >=20
> > > Booting the SMP kernel with kern.smp.disabled=3D1 shows good performa=
nce=20
values.
> >=20
> > Ok, can you try leaving SMP enabled but disabling specific cores instea=
d.
> > You do this via the APIC ID like so:
> >=20
> > hint.lapic.10.disabled=3D1
> >=20
> > Don't disable the BSP (I think it's ignored), and I would try disabling=
=20
all
> > 3 AP's at first and then enable the CPUs one a time to compare having 2=
=20
CPUs
> > vs 3 CPUs vs 4 CPUs.
>=20
> When booting with=20
>=20
> hint.lapic.10.disabled=3D1
> hint.lapic.12.disabled=3D1
> hint.lapic.14.disabled=3D1
>=20
> in /boot/device.hints the machine comes up to the login prompt on the=20
console and than freezes completely.  The same thing happens when I disable=
=20
APIC ID 14 only.
> Here is the verbose boot log.  It is pretty long.  But I thought it might=
=20
show some interesting information.

Ah, I have a bug with the 'hint.lapic' stuff. :(  Add the patch below and t=
hen=20
try testing with 'hint.lapic' again.

Index: amd64/amd64/mp_machdep.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
RCS file: /usr/cvs/src/sys/amd64/amd64/mp_machdep.c,v
retrieving revision 1.280
diff -u -r1.280 mp_machdep.c
=2D-- amd64/amd64/mp_machdep.c	23 Jan 2007 08:38:39 -0000	1.280
+++ amd64/amd64/mp_machdep.c	7 Feb 2007 17:36:07 -0000
@@ -632,6 +632,8 @@
 			continue;
 		if (cpu_info[apic_id].cpu_bsp)
 			continue;
+		if (cpu_info[apic_id].cpu_disabled)
+			continue;
=20
 		/* Don't let hyperthreads service interrupts. */
 		if (hyperthreading_cpus > 1 &&
Index: i386/i386/mp_machdep.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
RCS file: /usr/cvs/src/sys/i386/i386/mp_machdep.c,v
retrieving revision 1.273
diff -u -r1.273 mp_machdep.c
=2D-- i386/i386/mp_machdep.c	23 Jan 2007 08:38:39 -0000	1.273
+++ i386/i386/mp_machdep.c	7 Feb 2007 17:35:52 -0000
@@ -674,6 +674,8 @@
 			continue;
 		if (cpu_info[apic_id].cpu_bsp)
 			continue;
+		if (cpu_info[apic_id].cpu_disabled)
+			continue;
=20
 		/* Don't let hyperthreads service interrupts. */
 		if (hyperthreading_cpus > 1 &&

=2D-=20
John Baldwin
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