Re: 2.4 very slow memory access on abit kd7raid (kt400); ten times slower than on kg7raid

["freaky" <freaky@bananateam.nl>]

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...