Date: Wed, 7 Feb 2007 12:37:45 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-smp@freebsd.org Cc: Ludger Bolmerg <lbolmerg@web.de> Subject: Re: Fujitsu Siemens TX600 S3 performance issue Message-ID: <200702071237.45524.jhb@freebsd.org> In-Reply-To: <1802647172@web.de>
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On Wednesday 07 February 2007 08:45, Ludger Bolmerg wrote: > 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. > > When booting with > > hint.lapic.10.disabled=1 > hint.lapic.12.disabled=1 > hint.lapic.14.disabled=1 > > in /boot/device.hints the machine comes up to the login prompt on the console and than freezes completely. The same thing happens when I disable APIC ID 14 only. > Here is the verbose boot log. It is pretty long. But I thought it might show some interesting information. Ah, I have a bug with the 'hint.lapic' stuff. :( Add the patch below and then try testing with 'hint.lapic' again. Index: amd64/amd64/mp_machdep.c =================================================================== RCS file: /usr/cvs/src/sys/amd64/amd64/mp_machdep.c,v retrieving revision 1.280 diff -u -r1.280 mp_machdep.c --- 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; /* Don't let hyperthreads service interrupts. */ if (hyperthreading_cpus > 1 && Index: i386/i386/mp_machdep.c =================================================================== RCS file: /usr/cvs/src/sys/i386/i386/mp_machdep.c,v retrieving revision 1.273 diff -u -r1.273 mp_machdep.c --- 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; /* Don't let hyperthreads service interrupts. */ if (hyperthreading_cpus > 1 && -- John Baldwinhome | help
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