Date: Thu, 28 Jul 2005 09:23:38 -0700 From: ray@redshift.com To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: freebsd-amd64@freebsd.org Subject: Re: Benchmarks: AMD64 vs i386 on Dual 246 Opteron Message-ID: <3.0.1.32.20050728092338.01207628@pop.redshift.com> In-Reply-To: <20050728161908.GB64153@troutmask.apl.washington.edu> References: <3.0.1.32.20050728080526.00aa4098@pop.redshift.com> <86mzo7yvpe.fsf@xps.des.no> <3.0.1.32.20050728013152.00a4d188@pop.redshift.com> <86mzo7yvpe.fsf@xps.des.no> <3.0.1.32.20050728080526.00aa4098@pop.redshift.com>
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True, once you go over the 4GB limit it's a different ball of wax. However, until that time, it would be nice to get to the bottom of why 64 bit code is running half the speed of 32 bit code on the exact same machine - don't you think? Ray At 09:19 AM 7/28/2005 -0700, Steve Kargl wrote: | On Thu, Jul 28, 2005 at 08:05:26AM -0700, ray@redshift.com wrote: | > | > I've also heard the AMD's perform well under heavy database | > load - although I have not put any machine into production yet. | > | > As you say, you get a new shinney AMD and run to put a 64 bit | > OS on it thinking it will smoke the tires. But once you test | > it and start thinking about it, the 32 bit running faster makes | > sense. Maybe there needs to be a 20 bit OS :-) | > | | Drop 8 GB of memory into the box and see how the 32-bit | FreeBSD performs in comparison to the 64-bit FreeBSD | when your process consumes greater than 4GB of memory. | | -- | Steve | |
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