Date: Sun, 4 Nov 2007 22:19:14 +0000 From: Bob Bishop <rb@gid.co.uk> To: Pete French <petefrench@ticketswitch.com> Cc: freebsd-stable@freebsd.org Subject: Re: Best way to use more that 4 gigs of memory ? Message-ID: <A86E2853-8AAC-452F-8396-7111768D956F@gid.co.uk> In-Reply-To: <E1Iomkf-0007HH-JC@dilbert.ticketswitch.com> References: <E1Iomkf-0007HH-JC@dilbert.ticketswitch.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Hi, On 4 Nov 2007, at 21:11, Pete French wrote: > I have been doing some experiments with runnign 32 bit processed on > and amd64 kernel over the last couple of days and am wondering what > the general feel is for the best way to use over 4 gigs of memory. > As far > as I can see I have 3 options: > > 1) amd64 kernel + 64 bit processes > 2) amd64 kernel + 32 bit processes > 3) i386 kernel with PAE and 32 bit processes > > I was initially thinking that option 1 was the best, but > benchmarking it > the programs take 3 times longer to run that option 2! This > astounds me > and I intend to investigate why, but given it is rue then that > rules it out > as a viable solution for deploying stuff. I had similar results, I surmise (without evidence) it's to do with cache usage. > Which leaves either 32 bit processes on a 64 bit kernel or > alternatively > running under PAE on a 32 bit kerenel. I don't know a lot about PAE > and > was wondering if anyone had any advice either way as to which > wouldbe the most > stable and/or best performing. If your workload is CPU-intensive it probably doesn't matter; if it isn't, I'd do some more experiments. > cheers, > > -pcf. -- Bob Bishop +44 (0)118 940 1243 rb@gid.co.uk fax +44 (0)118 940 1295
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?A86E2853-8AAC-452F-8396-7111768D956F>