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To: Charles Henrich <henrich@crh.cl.msu.edu>
cc: Brian Tao <taob@nbc.netcom.ca>, freebsd-chat@FreeBSD.ORG
Subject: Re: Pentium II-266Mhz 
In-reply-to: Your message of "Mon, 26 May 1997 01:00:46 EDT."
             <19970526010046.05547@crh.cl.msu.edu> 
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Date: Sun, 25 May 1997 22:42:17 -0700
From: Amancio Hasty <hasty@rah.star-gate.com>
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If you like check out, for info on memory bandwith, pci bus, etc..

http://sysdoc.pair.com

	Amancio

>From The Desk Of Charles Henrich :
> On the subject of Re: Pentium II-266Mhz, Brian Tao stated:
> 
> > On Thu, 22 May 1997, Charles Henrich wrote:
> > > 
> > > 8:13pm crh> dd if=/dev/zero of=/dev/null bs=1m count=1000 1000+0 records
> > > in 1000+0 records out 1048576000 bytes transferred in 9.969560 secs
> > > (105177762 bytes/sec)
> > > 
> > > 8:14pm crh> dd if=/dev/zero of=/dev/null bs=128k count=8000 8000+0 record
s
> > > in 8000+0 records out 1048576000 bytes transferred in 4.389535 secs
> > > (238880886 bytes/sec)
> > 
> >     I presume the first involves the CPU going to main memory, while the
> >     second fits entirely in L2 cache?  What's the bandwidth over a PCI bus?
> >     132MB/sec?  It looks like the CPU can push almost twice that.  Time for
> >     a 100-MHz bus or a separate CPU-to-RAM bus...  
> 
> Yep, thats been my gripe for a long time.  The PCI bus sucks, it needs to be
> twice the bandwidth of the CPU (or more!) for growth, and memory access times
> need to go down.  I would bet if someone did a formal study, that a huge
> percentage of Intel cycles are spent waiting for loads..  Speed up the
> Pentium(Pro/PII) without changing a thing, except the motherboad!
> 
> -Crh
> 
>        Charles Henrich     Michigan State University     henrich@msu.edu
> 
>                          http://pilot.msu.edu/~henrich