[Coco] hard disk performance

[Tim Fadden]

Chuck,

Lots peppier than mine!

I am running mostly stock OS9L2 on a 6309 with scsisys 1.1 on two 
quantum 105s scsi drives, Disto 4in1 with no multipak
they both test about the same.

I get megaread times of 30sec.  I guess that would be about 34k/sec. So 
go ahead and make fun of my dog! he he he
Beats floppy's!

Tim Fadden


Chuck Youse wrote:


> So, quick question, folks - does anyone have any basic performance data
> for hard disks on 6809 NitrOS-9 Level II systems?  I only ask out of
> curiosity; I've tweaked my HDISK driver to get probably fairly close to
> maximum performance out of it (without being rude to the rest of the
> system by disabling interrupts or doing any busy-waiting) and megaread
> reports about 45K/sec transfers.  As far as usability goes, it seems
> pretty peppy - and given that it's written to be nice to a multi-tasking
> system, heavy disk I/O doesn't impact the rest of the system much
> (interactive processes remain beautifully responsive).
>
> I vaguely recall seeing numbers from megaread in the 70-80K range
> (reported by others), and I'm wondering how much of this is just a
> limitation of my hardware design, how much is due to the fact that I'm
> running on a stock 6809 Coco 3 vs a 6309-enhanced one.
>
> Any info out there?
>
> I have to say; back when I was a poor kid with a 128K Coco 3 and a pair
> of single-sided drives and a black/white TV, I loved the OS-9.  The
> addition of a hard disk makes the system a thousand times more useful.
> What a beautiful thing.
>
> C.
>
> [For those who are curious, some of the 'limitations of the design' I
> refer to above include not being interrupt-driven and having to diddle
> with MPI.Slct to map the hardware registers into FF40-FF4F, which
> necessitates quite a few cycles to read/write a register.  During the
> PIO transfers I try to group the transfers into 8s to minimize the
> overhead and simultaneously allow timely servicing of system
> interrupts.]
>
>
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco
>
>