Date: Tue, 02 Aug 2005 11:43:39 -0700 From: ray@redshift.com To: freebsd-amd64@freebsd.org Cc: freebsd-amd64@freebsd.org Subject: Re: Benchmarks: AMD64 vs i386 on Dual 246 Opteron Message-ID: <3.0.1.32.20050802114339.00a547c8@pop.redshift.com> In-Reply-To: <20050802181355.GP71672@dragon.NUXI.org> References: <3.0.1.32.20050802105941.00a547c8@pop.redshift.com> <3.0.1.32.20050729020609.00a6a240@pop.redshift.com> <3.0.1.32.20050728013152.00a4d188@pop.redshift.com> <3.0.1.32.20050728013152.00a4d188@pop.redshift.com> <3.0.1.32.20050729020609.00a6a240@pop.redshift.com> <3.0.1.32.20050802105941.00a547c8@pop.redshift.com>
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At 11:13 AM 8/2/2005 -0700, David O'Brien wrote: | On Tue, Aug 02, 2005 at 10:59:41AM -0700, ray@redshift.com wrote: | > Thanks David - needless to say, I'm going to be re-running all my benchmarks | ... | > I'll post my results when I have another machine in here and re-run the exact | > same benchmarks. This time I will be certain to confirm the situation on the | > SMP kernel with regard to the AMD64 branch. | | You need to be careful about what you are testing. | If you dual-boot 64-bit and 32-bit from the same disk, don't forget one | of them will be on a faster area of the disk. So you need a 2nd data | disk that is newfs'ed between each run to do your benchmarks on. | | At a minium, you should build a set of 32-bit binaries on FreeBSD/i386 | with CPUTYPE=k8. Run benchmarks under the 32-bit OS. | Then run the same benchmarks with the 32-bit binaries on the 64-bit OS. | (ie, you're just changing the kernel). | Then build 64-bit binaries and benchmark them. | You should use RELENG_6, not 5.x to make sure you're getting the best K8 | GCC we support along with the optimizations we've added since 5.x was | released. | | -- | -- David (obrien@FreeBSD.org) okay, thanks for the info. I'll keep that handy for when I have another machine to test. Ray
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