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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