Re: Problems with too much memory (?)
Bas Mevissen (sgm@stack.nl)
Thu, 24 Apr 1997 12:28:04 +0200 (MET DST)
Pavel Machek wrote:
:
: Hi!
:
: 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?]
:
If I rember right, there exists a BIOS setup option
'ONLY FIRST 16Mb CACHEABLE'
on (old?) motherboards with AMI BIOSes
Bas.
: --
: 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+
:
:
:
--
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