SMP kernel question..

SMP kernel question..

Post by ishwar ratta » Wed, 19 Nov 1997 04:00:00

I am running 3.0-971022-SNAP (with SMP enabled kernel) on a Tyan Tomcat-3
two CPU motherboard. The program `xcpustate' shows onlu one bar!!

I tried to see if applications run faster on a dual motherboard. Compiled
gcc- under GENERIC kernel times are

    1285u, 63.4s, 25:36.55 (and other numbers)

than tried the same under SMP enabled kernel and times are

    164u, 1440s, 31:54.37 (and other numbers)

Looks as if dual motherboard is going slower. Does the appllication
stay on the same CPU? Is there any other bench mark? How is SMP supposed
to work?  Any pointers will be appreciated.

Ishwar Rattan


1. Booting SMP kernel on non-SMP machines?


    Can I take it (based on recent experience) that it's a really bad idea
to try to boot an SMP kernel on non-SMP machines?  What about booting a
non-SMP kernel on SMP machines?

    Just curious, I suspect I'll know the answer to this question from
direct personal experience before any of you get a chance to answer me,
but I would at least like to hear some of the reasons why this
should/should not work.




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