Problems with too much memory (?)

Pavel Machek (
Tue, 22 Apr 1997 22:52:42 +0200 (MET DST)


This still may be hw problem, but aybe it is not.
My machine is 486DX2/80, 128kb level 2 cache (stolen from one 386 :-),
20MB ram (16M+4M). It compiles kernel about 32 minutes.

When I removed 4MB SIMM, compilation time went down to 22 minutes. I
thought that it is hardware problem, but I wanted to investigate it more.
So I put memory back and limited memory to 16M (mem=16M). Compile time
stayed at about 22 minutes.

So I suspect linux tfor having problems with too much memory.

My linux is 2.1.35, slightly modified (PCspeaker, Hypertech cdrom, Network
block device, mingo's performance patch into sched.c).

30% difference is quite a big one, and I suspect problems somewhere in mm
/ buffer code.

[BTW mingo's patch speeeded up my system by 30% some time ago - and it was
not still included in linux kernel. Why? Could someone compare 2.1.35's
performance with 2.0.29's?]

This is my little buggy signature...				Pavel
GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+