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") -- Michael Bane Atmospheric Physics Group University of Manchester -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
