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SubjectLinux SMP performance vs. UP: not a laurel
UP PII333 overclocked to 412MHz, 512MB memory:
24/7 one setiathome <8hr 45min constant

UP PII450 512MB memory, production machine:
24/7 one setiathome <8hr 10min constant

UP PIII550 512 MB memory, no load:
24/7 one setiathome <7hr 00min _VERY_ constant

All UP's 2.2.16, glibc-2.1.3, gcc-2.95.2, base SuSE 6.4.


SMP 2xPIII550 1GB memory, mostly unloaded:
24/7 _TWO_ setiathome running, time for the single seti:

2.2.7, libc5, gcc-2.7.2.3, base SuSE 6.1:
<8hr 50min, inconstant with values <7hr 50min
2.2.14, glibc-2.1.1, gcc-2.95, base SuSE 6.3:
>9hr 15min, inconstant with values >10hr 10min
2.2.16, glibc-2.1.3, gcc-2.95.2, base SuSE 6.4:
same as for 2.2.14, with some stategies like
memtest before/after setiathome starting,
mmap002, connections via ethernet 10M/RG-58,
telnet from other machines, find | cpio to tape
and others not noted, the time goes down:
<9hr 20min, but never constant as with the UP's.
2.4.0-test3 after reboot (sic!) >10hr 45min !!!


Now the SMP runs 2.2.16, I need it compatible for work.

Any _REAL_ and usable explication?
==================================

Willing to use the SMP for tests with seti.

Not in list, only reader & UNIX sysadm/usr since AT&T SVR2.

Regards
Mario

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