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Date:      Fri, 30 Jan 1998 15:57:47 -0800 (PST)
From:      Simon Shapiro <shimon@simon-shapiro.org>
To:        Jaye Mathisen <mrcpu@cdsnet.net>
Cc:        current <current@FreeBSD.ORG>, Steve Passe <smp@csn.net>, Alex <garbanzo@hooked.net>, Jason Evans <jasone@canonware.com>
Subject:   Re: -current, goliath, smp -- problems
Message-ID:  <XFMail.980130155747.shimon@simon-shapiro.org>
In-Reply-To: <Pine.NEB.3.95.971211000539.14624R-100000@mail.cdsnet.net>

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On 11-Dec-97 Jaye Mathisen wrote:
> 
> 
> On Tue, 9 Dec 1997, Jason Evans wrote:
> 
>> On Mon, 8 Dec 1997, Alex wrote:
>> in the neighborhood of 500 MB/sec, which is enough to feed 4 processors,
>> but quite inadequate for 8.  So, even though there are twice as many
>> processors, the performance gain is not impressive.
>> 
>> If there's anyone else out there that knows any better, please correct
>> me.
>> =)
> 
> While I can't correct you, I have a couple DEC ZX6000's, that when using
> the add-on memory boards, so there's something like 4GB of SIMMS, the
> memory path becomes 256bit wide, 4 way interleaved, and runs at some
> hellacious rate, and I remember the memory bandwidth being significantly
> higher than 500MB/s. 

A number I remember for the P6 bus is 562MB/Sec, as far as the P6 bus is
converned.  Regardless of the DRAM memory bus itself.

> 
> Heck, if somebody knows of some memory benchmarking software, I'd be
> happy
> to try it out.
> 

----------


Sincerely Yours, 

Simon Shapiro
Shimon@Simon-Shapiro.ORG                      Voice:   503.799.2313



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