Date: Wed, 29 Aug 2007 13:51:10 -0700 From: Josef Grosch <jgrosch@juniper.net> To: err <err@tollari.org> Cc: freebsd-hardware@freebsd.org Subject: Re: 8GB RAM: PAE or not PAE? Message-ID: <20070829205110.GA68658@juniper.net> In-Reply-To: <20070829174236.6c33ccfc@n2.lands.raad> References: <20070829174236.6c33ccfc@n2.lands.raad>
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On Wed, Aug 29, 2007 at 05:42:36PM +0200, err wrote: > Hi > > I have an HP DL380 quad core with 8GB of RAM and SAS disks in RAID, with freebsd 6 STABLE on it. > > Everything works fine, except for the RAM addressing problem: freebsd sees only 4GB. > I know it have been discussed, but it could be a problem to me for running a 64bit compiled system; what is the stability of a kernel compiled with the PAE option? > > I've a kernel with no modules, and before trying PAE I would know for other people experiences... > In particular I'm interested in the behavior of ciss, bce, em and usb stuff, and application like Perl, Ruby, PHP 5, MySQL server, heavy MAWK and bzip2 load. > > Also, if I boot a PAE kernel, in order to have all my RAM available, I have to set the hw.physmem variable to 8G ? > > Thanks > -- > Emmanuel Richiardone Based on my experience with PAE I would say, don't. I found PAE to be very brittle. Not all the drivers work well with PAE. Most recent Intel processors understand 64bit. I have several machines in our datacenter which are Intel 5160 running amd64. Josef -- FreeBSD 6.2 | Josef Grosch | Listen, strange women lying in ponds distributing jgrosch@juniper.net | swords is no basis for a system of government.
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