Subject: Re: DMA
To: Mauricio Tavares <raub@kushana.aero.ufl.edu>
From: Curt Sampson <curt@portal.ca>
List: port-sun3
Date: 01/14/1996 11:07:44
On Sat, 13 Jan 1996, 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?
Can you compile iozone and see what sort of stats you're getting?
I finally did get 1.1 installed on my 3/50 shoebox (it turns out
that it really doesn't like having sd0b before sd0a on the disk,
for some reason--I'd hoped to have my swap space at the beginning
of the disk to minimise head movement) but disk I/O crawled along
at about 20-30 K/sec, which is not unreasonable--for a floppy! I
thought, `Ah ha! I just have to make that change to the SCSI driver,'
which I did. My machine went down in flames.
I should have a newer, faster SCSI drive freed up this coming week
when I replace a drive in my 386 system; I'll try installing on
that and let everyone know how it goes.
> 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?
In a sentence? Cd /sys/arch/sun3/conf, make a new MACHINE (probably
by copying another config file) and edit it, config MACHINE, cd
../compile/MACHINE, make depend, make. :-)
cjs
Curt Sampson curt@portal.ca Info at http://www.portal.ca/
Internet Portal Services, Inc.
Vancouver, BC (604) 257-9400 De gustibus, aut bene aut nihil.