Memory upgrade causes slowdown; why?

Shawn Rutledge (ecloud@goodnet.com)
Tue, 22 Oct 1996 16:49:26 -0700 (MST)


OK I know this is just about a faq now, but can somebody please refresh
my memory?

I just upgraded my system from 16 megs to 32 megs, and now Linux crawls
(so bad that I took the new SIMM back out, temporarily I hope!) X takes
2 or 3 times as long to start up, kernel builds take longer, that sort of
thing. I remember somebody else asking that question and getting an
answer sometime in the last few months...

The problem affects NT 4.0 too (which I have on my other partition) so
I'm suspecting there's a fishy hardware problem rather than a config
problem, but then again maybe not...after all NT always crawls relative
to Linux (I was only hoping for a bit more stability than with Win95).

I'm running Slackware 3.1 on a 486DX4-100 system. It has 2 72-pin SIMM
slots, and I believe both SIMMs are 60-ns but they are different brands.
Both are also non-parity, non-EDO. I tried upgrading to 2.0.22 to see
if there was a difference, but otherwise it's stock slackware. I also
tried running it with each of the SIMMs, and it's just as fast with either
one, but it is slow with both, regardless which slots I put them in.

I'm aware of the build option to make it ignore all but the lowest 16 megs.
I'm also aware of being able to pass a memory parameter to the kernel
via lilo, but that seems irrelevant in that the memory is detected
properly, and I can see it getting used in Xosview as I start up apps,
but the CPU meter in Xosview seems pegged a lot more than it does
with 16 megs installed.

-- 
  _______                      KB7PWD @ KC7Y.AZ.US.NOAM   ecloud@goodnet.com
 (_  | |_)   Shawn T. Rutledge    on the web: http://www.goodnet.com/~ecloud
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