Date: Fri, 30 Nov 2007 15:20:36 +0000 From: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk> To: Jim Pingle <lists@pingle.org> Cc: freebsd-stable@freebsd.org, Pete French <petefrench@ticketswitch.com> Subject: Re: Also seeing 2 x quad-core system slower that 2 x dual core Message-ID: <1196436036.20314.12.camel@buffy.york.ac.uk> In-Reply-To: <475021CE.1000708@pingle.org> References: <E1IxvGp-000Mfu-Q7@dilbert.ticketswitch.com> <475021CE.1000708@pingle.org>
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On Fri, 2007-11-30 at 09:44 -0500, Jim Pingle wrote: > This may be a silly question, but have you tried reducing the RAM on the > quad core machine to 4GB so the machines match in that respect as well? > > I seem to recall a thread a while back about someone who had slowdowns in a > certain situation with large amounts of RAM (>4GB). This was with the Intel 965 chipset, and was fixed with a BIOS upgrade, something to do with the way the BIOS set cache info up about memory above 4Gb. A BIOS upgrade may be worth trying. Removing memory from the slow one toleave it with 4Gb may be a useful datapoint. Note that I don't think you can just set hw.maxmem as that makes no guarantee as to *whicch* physical 4Gb will get used. Finally, I assume you are using FreeBSD amd64 and not i386 in PAE mode? Posting dmesg outputs from both systems somewhere might be useful, I can't see it in the previous posts. Gavin
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