Date: Wed, 18 Dec 1996 09:34:38 -0800 (PST) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: richard@pegasus.com (Richard Foulk) Cc: freebsd-hardware@freebsd.org Subject: Re: EDO parit RAM (Was Re: Tyan ...) Message-ID: <199612181734.JAA17658@GndRsh.aac.dev.com> In-Reply-To: <199612180808.WAA21096@pegasus.com> from Richard Foulk at "Dec 17, 96 10:08:35 pm"
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> } > What's wrong with ECC mode only memory? Where can you find parity > } > } 15% loss of performance if I remember well. See the archives of the list. > } > > That seems doubtful. How about 15% on main memory accesses -- most > accesses are from cache. >From my testing on ASUS PCI/I-P55T2P4 Intel 430HX based boards it was infact a 12% degrade in -MEMORY- intensive benchmarks, infact the same benchmarks I used to find the 1% EDO speed up showed the 12% ECC slow down. This would tend to indicate that the slow down in the main memory system is significant when running in ECC mode, far more than one would expect. > > This sounds like the EDO gain that turned out to be 1%. Except that both where measured using the same set of tests, and thus the 15% (12% was my result) is real system performance loss. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation, Inc. Reliable computers for FreeBSD
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