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SubjectRe: SLOW machine when HIGHMEM enabled (1gb memory, kernel 2.4.22)
Matt Hahnfeld writes:
> I have an ASUS P4P800-VM motherboard with 2 sticks of 512mb PC3200 and
> a single 2.4 ghz P4 processor. The kernel is vanilla 2.4.22 configured
> for SMP (hyperthreading).
>
> When I use a kernel with high memory support off, I get good
> performance (despite not being able to use some of my memory). When I
> enable CONFIG_HIGHMEM4G the remaining memory is detected, but the
> machine takes a big performance hit and starts running very slow --
> ie. kernel compilation looks like it would take 5 days instead of 5
> minutes. /proc/meminfo doesn't look particularly strange and no
> strange log messages show up -- everything just runs slow...
>
> CONFIG_HIGHMEM64G produces the same results...
>
> Any suggestions?

Sounds like maybe the high RAM isn't cacheable.
What does /proc/mtrr and dmesg look like?

Have you verified that you're running the latest BIOS?
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