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Old 08-31-2012, 11:02 AM   #1
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Which CPU arch is min for SMP kernel?

The slackware readme file suggests running smp kernel even in a single core processor system. How far back would be suggested? Pentium/ii/iii, p4???
Old 08-31-2012, 11:09 AM   #2
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I think you can go as far back as the pentium pro, but that's just from memory. SMP kernel used to work fine on an old P3-800 box I used to have.
Old 08-31-2012, 11:45 AM   #3
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The help text of upcoming Slackware 14' installer confirms GazL's answer:
The default kernel is hugesmp.s, which requires ay least a Pentium Pro processor. If this kernel doesn't work for you, you may try the regular "huge.s" kernel, which supports i486 and better single CPU machines.
Old 08-31-2012, 02:21 PM   #4
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On a machine that never had issues with smp and a Celeron@ 2ghz I started getting "CPU temp above threshhold" after a recent -current upgrade. I can't be sure that it had anything to do with a newer kernel, but I didn't see it again when I switched to a non smp kernel. Having said that it is entirely possible it is just old hardware failing. I haven't left the machine on or used it much until I have time to thoroughly babysit it.
Old 08-31-2012, 06:27 PM   #5
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The SMP kernel will work fine on most older CPUs under the x86 umbrella. There are some it might have issues with so read the documentation carefully.
Old 08-31-2012, 07:49 PM   #6
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For me, when the SMP kernel has failed to boot, it has been because the processor does not support the 'cmov' instruction.
You can check this by using 'cat /proc/cpuinfo' and looking at the 'flags' line. If you search for 'linux cpu flags' you can find further information.


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