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From: bag@sinbin.demos.su (Alex G. Bulushev)
Message-Id: <199702250805.LAA17129@sinbin.demos.su>
Subject: Re: Memory speed of P6-200 (256k)
To: asami@vader.cs.berkeley.edu (Satoshi Asami)
Date: Tue, 25 Feb 1997 11:05:22 +0300 (MSK)
Cc: jin@george.lbl.gov, mark@quickweb.com, freebsd-hardware@freebsd.org,
        kuku@gilberto.physik.rwth-aachen.de, robsch@robkaos.ruhr.de
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
>