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Date:      Tue, 21 Nov 2006 11:43:25 -0500
From:      Jerry McAllister <jerrymc@msu.edu>
To:        Zbigniew Szalbot <zbyszek@szalbot.homedns.org>
Cc:        Martin Alejandro Paredes Sanchez <mapsware@prodigy.net.mx>, freebsd-questions@freebsd.org
Subject:   Re: changing swap size
Message-ID:  <20061121164325.GC45815@gizmo.acns.msu.edu>
In-Reply-To: <Pine.BSF.4.64.0611210735240.80005@192.168.11.51>
References:  <Pine.BSF.4.64.0611131427160.22408@192.168.11.51> <Pine.BSF.4.64.0611140817060.95811@192.168.11.51> <200611192329.36312.mapsware@prodigy.net.mx> <Pine.BSF.4.64.0611210735240.80005@192.168.11.51>

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On Tue, Nov 21, 2006 at 07:39:37AM +0100, Zbigniew Szalbot wrote:

> Hello,
> 
> On Sun, 19 Nov 2006, Martin Alejandro Paredes Sanchez wrote:
> 
> >>>I think not. ?Are your computer still swaping?
> >>
> >>Yes, it is. I am planning to add more RAM.
> >
> >I mean, after you add memory, Are your computer still swaping?
> 
> I tried adding memory to it but it wouldn't accept it. I tried 512 SDRAM 
> 133Mhz, then 256 SDRAM 133Mhz but in both cases it failed to work with it.
> 
> It is an older Compaq machine. I had to shut it down yesterday to install 
> the memory and after rebooting I saw that no swap was used. Today I see 
> that a few KB of swap have already been used. Currently thy system has 320 
> MB RAM.

I don't know what your hardware problem is that it won't accept the
extra memory - maybe the wrong type or it needs to be in certain
groupings.

But, as for using swap space, remember that the system also uses the
swap space for paging and it always migrates out old pages at various
times.   So some swap space will show up as being used, even if the
system is not really swapping or doing serious paging.   The problem 
only comes up when there is such a deficit of memory that it begins 
having to run from paged memory (eg forcing some pages out to allow 
some in for execution or data) instead of just hanging on to a few 
things there.   

Good luck on the memory addition.
Check with Santa Claus about getting a newer machine
that will accept lots more memory.

////jerry

> 
> >If you can add enough memory, so you computer don't swap, you are gone to 
> >get
> >best performance.
> 
> Yep, the problem only is why it wouldn't accept it. I am taking the 
> specification it to the computer shop and will see if they are any wiser.
> 
> Thanks anyway!
> 
> -- 
> Zbigniew Szalbot
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