Re: [FAQ?] More ram=less performance (maximum cacheable RAM)

From: idalton@ferret.dyndns.org
Date: Wed Aug 22 2001 - 16:26:36 EST

On Wed, Aug 22, 2001 at 07:12:13AM -0400, Wakko Warner wrote:
> > >
> > > It also has nothing to do with Linux. Some motherboard's TAG RAM do not
> > > allow for caching more than xMB.
> >
> > I'm just proposing to update the FAQ to help people like me
> > that thinking to gain speed doubling the system ram have seen
> > a severe performance drop for certain task like compiling the
> > kernel .
> >
> > Answer :
> > It has nothing to do with Linux, maybe your motherboard's TAG Ram
> > do not allow for caching more than xMB.
>
> The bios has something to do with that as well. I have a dual pentium
> machine at work that was really slow. I looked in the bios and it has an
> option to cache 64mb or 512mb. speed up my kernel compiles (2.2.x) by about
> 12 minutes. (took 20, after the change, it took about 8)

Mine has this option, but kernel OOPSes with the option set to 512MB.
It's a TMC TD5TH. I've posted the OOPS before. I can post if anyone
wants to see it. 

-- 
Ferret

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