10 Nov
2005
10 Nov
'05
7:05 a.m.
On 11/9/05, Brad Parker <brad at heeltoe.com> wrote:
...
will read, slowly. I would be interesting to see how long (in comparison)
these two took:
dd if=syssrc.tar of=/dev/null bs=16k count=1000
dd if=/dev/zero of=blah.null bs=16k count=1000
I suspect the write will be faster, and reflect the true speed of the i/o.
Now both r/w are working with block mode DMA. The read speed is now
780190 bytes/sec,
the write speed 963764 bytes/sec. It conforms your analysis. The board
now beats Viking QDT, but is still slower than other boards. Maybe it
will be a little bit faster with RT11. There can be small improvements
when I clean up the code too. But I don't expect it to be faster than
CMD CQD220. What I can say is it is quite usable.
Thank you guys for helping me about the speed issue. The next step is
to port the C under DOS code to 80188XL.
best wishes,
vax, 9000
...