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Date:      Tue, 21 Nov 2006 14:00:43 -0500
From:      Chuck Swiger <cswiger@mac.com>
To:        Zbigniew Szalbot <zbyszek@szalbot.homedns.org>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: changing swap size (fwd)
Message-ID:  <45634CDB.80203@mac.com>
In-Reply-To: <Pine.BSF.4.64.0611211153250.4053@192.168.11.51>
References:  <Pine.BSF.4.64.0611211153250.4053@192.168.11.51>

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Zbigniew Szalbot wrote:
> As an update for RAM problems, it turned out I had to install BX SDRAM 
> memory to get it to work. Interestingly enough, the original memory was 
> not labeled as BX... but then... all that matters is that I have now 
> 512MB RAM which is not too much but all I could afford to get at this 
> point (BX RAM is much more expensive). I am interested whether this 
> added RAM will minimize/exclude swap use.

The added RAM will certainly help to minimize or reduce swapping, if it is 
occurring.  But you might want to post the output of "vmstat -s" after the 
system has been under normal load for us to evaluate how much benefit you're 
likely to see.

With regard to what I assume you have is a 440BX chipset, the RAM requirements 
  for it seem to be [1]:

> Description
> intel BX chipset won't recognize SDRAM correct.
> 
> Solution
> intel 440BX chipset has certain limitations:
> 
> 1. A maximum of 1GB RAM can be adressed.
> 2. Only SDRAM modules consisting of max. 64MBit (unbuffered) or 128MBit (buffered / registered) chips are supported.
> 
> Largest supported SDRAM modules (unbuffered):
> 4 x 64MBit = 32MB
> 8 x 64MBit = 64MB
> 16 x 64MBit = 128MB (double sided OR double height)
> 32 x 64MBit = 256MB (double sided AND double height -> KEEP AWAY !)
> 
> Largest supported SDRAM modules (registered / buffered -> look for row of small buffering chips on module):
> 4 x 128MBit = 64MB
> 8 x 128MBit = 128MB
> 16 x 128MBit = 256MB (double sided OR double height)
> 32 x 128MBit = 512MB (double sided AND double height -> KEEP AWAY !)

-- 
-Chuck

[1]: Second or third hit for "BX SDRAM" gives:

www.plasma-online.com/english/help/solutions/bx_chipset_sdram.html



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