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Old 11-26-2006, 05:47 AM   #1
Registered: Apr 2004
Distribution: Debian -unstable
Posts: 700

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SMP kernel - Debian unstable on Intel Celeron

$ uname -a
Linux pear 2.6.18-2-686 #1 SMP Wed Nov 8 19:52:12 UTC 2006 i686 GNU/Linux
$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      : Intel(R) Celeron(R) CPU 3.06GHz
stepping        : 9
cpu MHz         : 3059.517
cache size      : 256 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 lm constant_tsc up pni monitor ds_cpl tm2 cid cx16 xtpr lahf_lm
bogomips        : 6126.41
Now.. as you can see.. I don't *need* SMP support. Have I fscked something up and installed a "non-default" kernel that has SMP support.. or does the -i686 default kernel have SMP enabled by default?

Also.. every now and then I get warning messages "CPU0: Temperature above threshold." whilst doing rather normal tasks [i.e. using Firefox, not *always*, just on occasion]. I don't remember getting such messages whilst using Slackware/Gentoo/etc. so I can't figure out why they're appearing under Debian SID. [I don't want to *disable* the option that prints these messages when the temp is high, I just want to know the cause why the temp is high].
Old 11-26-2006, 07:02 AM   #2
Registered: May 2006
Location: UK
Distribution: Debian
Posts: 448

Rep: Reputation: 37
Nope you're not alone I too have the same message on the 2.6.18-2-k7 kernel. It appears that smp is enabled by default now, but I suppose it makes things simpler for the kernel maintainers. I can't see it making a huge difference to performance or causing your hardware to overheat but you could always recompile...
Old 11-26-2006, 09:00 AM   #3
Dutch Master
Senior Member
Registered: Dec 2005
Posts: 1,686

Rep: Reputation: 124Reputation: 124
As from a recent kernel (2.6.16 or .17 I believe) an SMP-enabled kernel comes as standard. It shouldn't hurt performance (otherwise the developers wouldn't have changed it) but if you feel the need to run on a single-threaded kernel a recompile is the only option.

As for those temp-warnings: this is related to the temp-settings in your BIOS. If they're still default settings you can safely set them up a few degrees higher.


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