Date: Tue, 25 Feb 1997 11:05:22 +0300 (MSK) From: bag@sinbin.demos.su (Alex G. Bulushev) To: asami@vader.cs.berkeley.edu (Satoshi Asami) Cc: jin@george.lbl.gov, mark@quickweb.com, freebsd-hardware@freebsd.org, kuku@gilberto.physik.rwth-aachen.de, robsch@robkaos.ruhr.de Subject: Re: Memory speed of P6-200 (256k) Message-ID: <199702250805.LAA17129@sinbin.demos.su> In-Reply-To: <199702250728.XAA05308@silvia.HIP.Berkeley.EDU> from "Satoshi Asami" at Feb 24, 97 11:28:08 pm
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> > * > Hmm, how come my new P6NP5 with P6-200 and 96MB RAM (parity mode) can > * > give me only about: > * > > * > >> dd if=/dev/zero of=/dev/null bs=1m count=1000 > * > 1000+0 records in > * > 1000+0 records out > * > 1048576000 bytes transferred in 18.359226 secs (57114390 bytes/sec) Asus P/I-P65UP5 with C-P6ND single P6-200 256k and 256MB RAM EDO fbsd 2.2-GAMMA dd if=/dev/zero of=/dev/null bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 12.738651 secs (82314524 bytes/sec) Alex. > > * Do not waste time to play this game. The "dd" is O.S. dependent code. > > Sorry I didn't write the OS version; I am running 3.0 from just before > the Lite/2 merge. > > * It does not give you what is real memory speed on your system. The result > * from dd is really depended on the O.S. you are running. If you run 2.2 or > * higher, you will get much better performance than 2.1.x. > > Well I wouldn't ask the list if it's just dd but I've run several > memory tests of my own and this machine always comes out looking very > bad compared to the P5-133 (Triton-II) it replaced. It's always about > half, unless the whole thing fits in the 512K L2 cache (in which case > it smokes). > > * 440FX does have worse memory speed than Triton-{I,II}; even though P6 has > * much better CPU speed, but the PCI controller (440FX) is worse. > > I know that. But there are some people seeing 80MB/s or more and some > (including myself) who only get about 60MB/s on an apparently > identical chipset. > > Satoshi >
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