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Date: Tue, 10 Jun 1997 11:25:36 +0200
From: Stefan Esser <se@FreeBSD.ORG>
To: Howard Lew <hlew@www2.shoppersnet.com>
Cc: Craig Johnston <craig@gnofn.org>, hardware@FreeBSD.ORG
Subject: Re: poor memory bandwidth on ABIT IT5H rev 1.5
References: <Pine.GSO.3.95.970606163225.26412A-100000@sparkie.gnofn.org> <Pine.BSF.3.91.970609183922.16617A-100000@www2.shoppersnet.com>
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In-Reply-To: <Pine.BSF.3.91.970609183922.16617A-100000@www2.shoppersnet.com>; from Howard Lew on Mon, Jun 09, 1997 at 07:12:07PM -0700
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On Jun 9, Howard Lew <hlew@www2.shoppersnet.com> wrote:
> I thought the TX was better than the VX, so I compared several
> motherboards with dd if=/dev/zero of=/dev/null bs=1m count=1000
> 
> CPU is AMD K5-PR133
> 
> FIC PT2006 (Intel VX) with 256K PB Cache & FreeBSD-2.1.7.1R
> Got 65MB/s
> 
> FreeTech F63T (Intel VX) with 256K PB Cache & FreeBSD-2.1.7.1R
> Got 62MB/s
> 
> FreeTech F79 (Intel TX) with 512K PB Cache & FreeBSD-3.0SNAP-6/6/97
> Got 43MB/s

Does the code in FreeBSD-current use the FPU bcopy for the AMD K5 ???
> 
> Is there something different about 3.0SNAP6/6/97?  Is there any option
> parameter for the kernel config for the K5-PR133?  Unfortunately, 2
> parameters changed, so I can't tell if it is the MB or the OS.  I decided 
> to go with 3.0snap because of this missing TX PCI & IDE drivers.

You won't see much of a difference between 2.1.x and -current, with
regard to chip-set support. The TX does not need any specific code, 
and I doubt that the EIDE code in -current know about the TX IDE
chip ...

So you could have used 2.1.7 for the TX as well!

> All three tests were done with 32MB EDO memory (set to best memory
> settings). 

The VX is known to perform badly with EDO, and just very slightly
better than a TX (with EDO), if the VX got SDRAM modules ...

Regards, STefan