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SubjectRe: Going from 32M to 48M, Linux crawls!
Steffen Grunewald wrote:
>
> "Kayvan Sylvan writes"
> |>
> |> Hi folks,
> |>
> |> I just put another 72pin 16Meg SIMM into my machine (memory prices are
> |> rock bottom right now).
> |>
> |> When I rebooted, Linux (1.99.9) was dog slow!!! Does anyone have any
> |> ideas?
> |>
> |> I swapped memory chips around, tested memory, everything else I could
> |> think of, but putting in the extra RAM slowed down my machine. The
> |> chips themselves are fine.
> |>
> |> I then booted linux with mem=16M and it was fast, and with mem=32M
> |> (the amount I used to have) and it was also fast. Since I haven't
> |> uninstalled the hardware, I'm assuming this is a software problem. I'm
> |> running with 32M (even though I have 48M installed).
> |>
> |> Has anyone seen this before? Please, please, please, someone tell me
> |> there's a patch! ;-)
> |>
> |> ---Kayvan
>
> Looks like your cache won't work with the extra 16 MB. Depending on the
> kernel's memory mapping strategy, the code which is accessed most, is
> now located in un-cached memory, so your system _must_ crawl.
>
> Try changing your CMOS settings / adding more cache.
>

Does it mean that Linux can only use cached memory?
I don't know why if it is the case. As we all know that
the only problem with un-cached memory is the SPEED.


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