Re: smp kernel boots from Knoppix but not Sarge
On (09/05/05 23:28), michael wrote:
> On Mon, 2005-05-09 at 23:20 +0100, Clive Menzies wrote:
> > Hi
> >
> > I have a couple of servers (identical spec) with the advertised cpu as:
> > 3.2GHz 3.2GHz Intel P4 Prescott
> >
> > If I boot from Knoppix I get:
> > # uname -a
> >
> > Linux Knoppix 2.6.7 #2 SMP Wed Jul 28 04:25:36 CEST 2004 i686 GNU/Linux
> >
> > # cat /proc/cpuinfo
> >
> > processor : 0
> > vendor_id : GenuineIntel
> > cpu family : 15
> > model : 3
> > model name : Intel(R) Pentium(R) 4 CPU 3.20GHz
> > stepping : 4
> > cpu MHz : 3193.360
> > cache size : 1024 KB
> > physical id : 0
> > siblings : 2
> > fdiv_bug : no
> > hlt_bug : no
> > f00f_bug : no
> > coma_bug : no
> > fpu : yes
> > fpu_exception : yes
> > cpuid level : 5
> > wp : yes
> > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pni
> > monitor ds_cpl cidbogomips : 6324.22
> >
> > processor : 1
> > vendor_id : GenuineIntel
> > cpu family : 15
> > model : 3
> > model name : Intel(R) Pentium(R) 4 CPU 3.20GHz
> > stepping : 4
> > cpu MHz : 3193.360
> > cache size : 1024 KB
> > physical id : 0
> > siblings : 2
> > fdiv_bug : no
> > hlt_bug : no
> > f00f_bug : no
> > coma_bug : no
> > fpu : yes
> > fpu_exception : yes
> > cpuid level : 5
> > wp : yes
> > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pni
> > monitor ds_cpl cidbogomips : 6373.37
> >
> > However, running sarge I can't get an smp kernel to boot - it hangs on
> > 'acpi'
> >
> > # uname -a
> > Linux Venus 2.6.8-1-686 #1 Thu Nov 25 04:34:30 UTC 2004 i686 GNU/Linux
> >
> > # cat /proc/cpuinfo
> > processor : 0
> > vendor_id : GenuineIntel
> > cpu family : 15
> > model : 3
> > model name : Intel(R) Pentium(R) 4 CPU 3.20GHz
> > stepping : 4
> > cpu MHz : 3193.438
> > cache size : 1024 KB
> > fdiv_bug : no
> > hlt_bug : no
> > f00f_bug : no
> > coma_bug : no
> > fpu : yes
> > fpu_exception : yes
> > cpuid level : 5
> > wp : yes
> > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pni
> > monitor ds_cpl cidbogomips : 6324.22
> >
> > I guess it's something to do with hyperthreading (which shows up in the
> > BIOS). I would welcome some enlightenment as to why Knoppix reports two
> > processors but sarge (and Debian From Scratch) only seem to recognise
> > one.
>
>
> For >1 processor, you need an SMP kernel but the one you quote for Sarge
> isn't. I got mine from backports. I turn off HT (but am still on 2.4
> kernel which isn't as good apparently at scheduling as 2.6) since on my
> 2 Xeon box, with HT on it's as likely 2 threads run on phy PE#0 rather
> than one on PE#0 and other on PE#1
>
> n$ uname -a
> Linux ratty 2.4.27-1-686-smp #1 SMP Wed Dec 1 19:50:17 JST 2004 i686
> GNU/Linux
>
> (Note the "-smp")
Thanks Michael
Yes - I know I need an -smp kernel but I can't seem to get the
2.6.8 smp kernel to boot - I tried the 2.6.11 smp kernel (from sid)
which booted but gave rise to another problem - it wouldn't bring up the
software raid1 on boot (which was the problem I had originally when
installing the machines). But it didn't report two processors which is
why I'm somewhat confused - these are a client's production servers and
so I'm reluctant to muck around with them too much.
I don't think I can use a 2.4 kernel because the raid configuration is
on a pair of SATA drives.
I need to take one machine down and verify whether there are actually
two processors in there. It was a few month s ago that I set them up
and I was pretty sure there were 2 but because I needed to get them up
in a hurry and I couldn't get the smp kernel to work properly, I stuck
with the single processor kernel.
Regards
Clive
--
www.clivemenzies.co.uk ...
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