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I wouldnt worry about the 'Assuming 33MHz system bus' message, thats mostly about the pci bus, use 'hdparm' to verify that your drives are using the correct udma mode.
Well my harddrives are fine. They transfer at 50MB/sec so I think that's fast enough. Well it's the pci bus that's being used between the tv card and the graphics card. At least as far as I heard the agp card also works through the pci bus (might be getting that wrong though).
But I was wondering about the detection of the cpu speed, that's what seemed kind of weird. I guess I just need to take some time and figure it out, just don't have high priority for it since everything is working.
Distribution: Red Hat 8.0, Slackware 8.1, Knoppix 3.7, Lunar 1.3, Sorcerer
Posts: 771
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Quote:
Originally posted by wdingus On my Xeon numbers, no Hyperthreading is not enabled. It would show as having 4 CPUs to Linux if it were. Flipped me out the first time I saw that
That is the point. I'm curious to see how much of a performance difference in a multithreaded app. Also curious to know why you have it turned off!
Distribution: Slackware, (Non-Linux: Solaris 7,8,9; OSX; BeOS)
Posts: 1,152
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Originally posted by MasterC
(2 x ~1.2 = ~2.4) = ~5000 Mips ( ~ 2083 Mips/Ghz )
(2 x ~2 = ~4) = ~8000 Mips ( ~ 2000 Mips/Ghz )
Shouldn't it be more than that (again, yes I know they are bogus...)? Like I said I am suckin really bad at math lately, so I cannot seem to remember how to figure out what each bogomip equals per GHz...
Shouldn't the Xeon CPU be quite a bit more? Also, shouldn't there be more of a synergistic effect from the 2 Xeon's at 2Ghz, meaning there should be more Mips per Ghz?
"Mips" is Million instructions per second. This is dependent on,
not only the clock speed ("GHz"), but also the number of
instructions per clock cycle. The different processors have
different instructions per clock, so you can't just find a simple,
linear function that maps between clock speed and Mips (well,
you may be able to for ~identical processors). Yeah, BogoMips
is meaningless for comparison, but you can still count the
number of instructions per second, and that'll be different for the
different chips. . .
i dont know why he has his hyperthreading disabled but usually its because for programs that are not made for multiprocessor machines hyperthreading can hurt performance
It's a brand new machine for a customer I just loaded.. I've turned hyperthreading on then off and played around with a few things to see what difference it makes. I tried what is probably a "bad" test for hyperthreading ability and saw no increase. I ran the distributed.net code-cracking client and let it use 2 or "4" CPUs and saw no increase in speed. Again though, that's probably not a good test. Not an easy way to test the actual application it'll be used for probably. Primary a MySQL/Innodb database server and Apache/PHP web server as well as Samba and a few other things. Hmm... If it doesn't crash or experience any wierd symptoms I'll probably leave hyperthreading on I suppose. Either way it is nice and fast though!
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