Re: Suggestions for "the fastest" Q22/SCSI-interface?
>Tim Shoppa wrote:
>I did (and published) some benchmarks of SCSI MSCP-emulating
>controllers probably a decade ago. And indeed the CMD CQD 440 was the
>winner. But they all beat the pants off a RQDX3!
>Here are the peak data rates measured for read and write 64
> Read Write
> ---------- ----------
>Andromeda SCDC 2.298 MB/s 1.131 MB/s
>CMD CQD440 2.397 MB/s 1.525 MB/s
>CMD CQD220 1.418 MB/s 0.882 MB/s
>CMD CQD220A 2.088 MB/s 1.409 MB/s
>DEC RQZX1 1.379 MB/s 1.097 MB/s
>Viking QDT 0.846 MB/s 0.704 MB/s
>DEC RQDX3 0.164 MB/s 0.161 MB/s
>The benchmarks were done under RT11FB 5.7 doing 1, 2, 4, 8, 16,
>32, and 64 block-at-a-time READW's and WRITW's to 16384-block
>data files. A KDJ11B (PDP-11/73) CPU with 2 Megabytes of Clearpoint
>non-PMI memory was used for the bencharmks. With the SCSI
>controllers a Barracuda 7200 RPM ST15230N drive was used; with
>the RQDX3 a RD52 drive was used.
Jerome Fine replies:
I would VERY much appreciate an opportunity to run the identical
benchmark and compare it with the ESDI controller that I have,
a Sigma RQD11-EC. Any possibility of obtaining the code?