Messages in this thread |  | | From | Rob Landley <> | Subject | Re: sis630/celeron perf sucks? | Date | Sat, 6 Oct 2001 18:24:18 -0400 |
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On Saturday 06 October 2001 16:06, Larry McVoy wrote: > Has anyone out there seen similar problems with SIS630 motherboards? > I know that we discussed this recently and people said that the graphics > chip is eating memory bandwidth but I am not using it, it isn't even in > SVGA mode, it's in text mode and screen blanked. I also tried setting > the AGP mem down to 2MB and that made no difference. > > The reason I care is that I like these little cheap boxes called "book pcs" > and the older model was BK810 and used the i810 chipset but the newer ones > are BK630 and use the SIS630 chipset. > > The new ones suck on all the stuff I care about, compiles, BitKeeper > regressions, just general software dev stuff. > > Any insight appreciated.
Run memtest86 to see what your memory bandwidth is.
You can also compare a tight loop ala bogomips with dirtying about as many pages as you have cache (memtest86 can find this), with dirtying more pages than you have cache in a big evil loop.
If this shows that your problem ISN'T memory bandwidth, then you'll have learned something.
> The bummer is that the memory subsystem sucks doggy doo doo on the former. > Is this a motherboard problem or do the newer celerons suck that bad on > purpose?
All the celerons I know about have a 66 mhz front side bus speed. (Actually there was a notebook version with a 100mhz fsb, but no desktop ones I know of.) It's a totally artificial limitation to get you to buy a real Pentium III. Intel crippling its low-end to avoid hurting the high end. (They let AMD do that for them. :)
I've got links bookmarked about this somewhere. You can probably find it on Tom's Hardware, or check google...
> Check out the bandwidth stuff, the second row should be faster but isn't:
Yup. Blame Intel's marketing department. This isn't a SIS problem, that's pure Intel's crippling of the DeCeleron...
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