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Date:      Thu, 17 Jan 2008 16:48:14 -0500
From:      Bill Moran <wmoran@potentialtech.com>
To:        robert@webtent.com
Cc:        Robert Fitzpatrick <lists@webtent.net>, Ivan Voras <ivoras@freebsd.org>, freebsd-questions@freebsd.org
Subject:   Re: db performance
Message-ID:  <20080117164814.e1c7a086.wmoran@potentialtech.com>
In-Reply-To: <1200605937.7281.79.camel@columbus.webtent.org>
References:  <1200602606.7281.48.camel@columbus.webtent.org> <fmogoe$mbc$1@ger.gmane.org> <1200605937.7281.79.camel@columbus.webtent.org>

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In response to Robert Fitzpatrick <lists@webtent.net>:

> On Thu, 2008-01-17 at 22:19 +0100, Ivan Voras wrote:
> > Robert Fitzpatrick wrote:
> > 
> > > real memory  = 3220635648 (3071 MB)
> > > avail memory = 3150565376 (3004 MB)
> > > 
> > > we have 3GB of RAM available with actually 4GB physical RAM installed?
> > 
> > If you're using a 32-bit (i386) kernel you need PAE. Or switch to 64-bit 
> > (amd64).
> 
> Yes, this is something else I've found I need to do to these i386
> servers since we upgraded the memory, I guess I'll get PAE in the kernel
> and switch the RAID, should provide quite a difference, yes? Some people
> have suggested the PAE drivers may not be stable with my hardware.

I don't recommend PAE simply because amd64 works so well and PAE is
a holdover hack.

That being said, if your hardware is i386 only, you're stuck with PAE.

-- 
Bill Moran
http://www.potentialtech.com



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