Messages in this thread |  | | Date | Mon, 03 Jun 1996 19:07:44 +1000 | From | Lawrence Chim <> | Subject | Re: Going from 32M to 48M, Linux crawls! |
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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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