From: mrd@ecs.soton.ac.uk (Mark Dobie) Subject: Re: KERNEL: question about >16Mb RAM Date: 8 Feb 1993 10:00:41 GMT
In <mrd.728932252@lisa> mrd@ecs.soton.ac.uk (Mark Dobie) writes:
>I just upgraded my machine from 8Mb to 20Mb RAM, so naturally the first
>thing I did was to recompile the kernel without the 16Mb RAM limit...
>...and the first thing I noticed after that was very sluggish screen
>update in X. After rebooting with a 16Mb limited kernel things seem to
>be back to their normal speed.
Thanks for all the email everyone :)
The overwhelming conclusion is that I need to upgrade the amount of
cache on my motherboard. The reason for the slowdown is that the cache
is arranged so that it caches a particular range of memory addresses.
When an access occurs outside this range (such as in the area between
16Mb and 20Mb) the memory is uncached and everything slows right down :(
Another alternative is to use the 4Mb as a RAM disk...I guess I could
swap to it, or maybe use it as /tmp.
Mark.