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SubjectRe: 2.4 very slow memory access on abit kd7raid (kt400); ten times slower than on kg7raid
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l> Everything slowed down. The easiest way to demontsrate this is by looking
at
> these figures:
>
> raid5: measuring checksumming speed
> - 8regs : 2343.600 MB/sec
> - 32regs : 1944.000 MB/sec
> - pIII_sse : 4163.600 MB/sec
> - pII_mmx : 3584.400 MB/sec
> - p5_mmx : 4600.800 MB/sec
> -raid5: using function: pIII_sse (4163.600 MB/sec)
> + 8regs : 228.400 MB/sec
> + 32regs : 199.200 MB/sec
> + pIII_sse : 352.000 MB/sec
> + pII_mmx : 316.800 MB/sec
> + p5_mmx : 432.800 MB/sec
> +raid5: using function: pIII_sse (352.000 MB/sec)
>
> Old motherboard above, new below. (Why it chose pIII_sse even when p5_mmx
> was faster is also an interesting question... :)

I have seen the same on a precompiled slackware 8.1 raid.s kernel I tried
for my promise controller. It's an AMD AthlonXP 2000+. Like you I found that
the PIII_SSE was slower than the P5_MMX and still got selected. I got higher
numers than you though, around your old mobo's speeds.... (KT333 chipset).
(MSI KT3 Ultra2-R). specs are in the KT333, IO-APIC, Promise Fasttak, Initrd
topic.

the 5 disks spanning ram image doesn't even load properly with me, maybe
it's caused by memory problems as well? Tho' I thought north bridges are for
memory access whilst I only get a message that my southbridge isn't
recognized...



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