Date: Wed, 18 Dec 1996 08:10:04 -1000 From: richard@pegasus.com (Richard Foulk) To: freebsd-hardware@freebsd.org Subject: Re: EDO parit RAM (Was Re: Tyan ...) Message-ID: <199612181810.IAA03525@pegasus.com> In-Reply-To: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> "Re: EDO parit RAM (Was Re: Tyan ...)" (Dec 18, 9:34am)
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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. } So what kind of impact does this have on `make world'? It can't be *that* bad -- unless ECC disables the cache ... I think your benchmark is hitting a sour-spot. Richard
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