Subject: Re: DMA
To: Mauricio Tavares <raub@kushana.aero.ufl.edu>
From: Jason Thorpe <thorpej@nas.nasa.gov>
List: port-sun3
Date: 01/14/1996 10:13:12
On Sat, 13 Jan 1996 23:43:41 -0500 (EST)
raub@kushana.aero.ufl.edu (Mauricio Tavares) wrote:
> Where was I? Oh, yes. So I now have a 1GB SCSI2 drive attached
> to the 3/50 replacing the CDC 96141-155. Currently, it takes quite a lot
> of time to access the drive; for some reason it reminds me of a C64.
> Would enabling the DMA "mode" speed up this drive so that I will be able
> to load X in my lifetime?
Definitely. I noticed _AMAZING_ performance improvements when I did this
on my 3/60. Spin-waiting around a PIO transfer is ... horrifying :-)
> In an unrelated topic, how do you rebuild the kernel in NetBSD?
> In ultrix we had this /usr/sys directory where the kernel config file
> would be hidden. Would NetBSD have something similar?
cd /usr/src/sys/arch/sun3/conf
cp GENERIC PICKLE
vi PICKLE <change to your liking>
config PICKLE
cd ../compile/PICKLE
make depend && make
Whee! :-)
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