🚀 go-pugleaf

I wrote a simple SCSI benchmark program for the NeXT over a year ago. It
was primitive. I recall having to use only the "generic" SCSI driver. I
recall Having to be root level when running. I remember being dissapointed
that the generic driver had a 64K DMA burst or something like that that
hindered raw high speed data throughput (compared to the real non-generic
drivers. It took one day to write and I am not even a NeXT programmer (Mac
guy) so I know you can easily do it on the NeXT.

Its very simple compared to Apples SCSI manager crap. (Which by the way is
going to be totally obsoleted in almost every way when the Cousin Itt
Apple SCSI manager ships soon (on the Cyclones for certain) Its called
SCSI Manager 4.3 and it is very good, but will not allow simultaneous use
of two Quadra SCSI chips in the same versatile manner as using TIBs
allows. TIBs can be self modifying and do lots of neat-o stuff but no TIB
support is possible on future SCSI managers from Apple. Thus you cannot
stripe a partition across two devices that have dissimilar data transfer
effective rates (1 3 meg per second device and one 1.5 meg per second
device) and instruct the New Apple SCSI manager 4.3 to transfer 10 megs of
striped data from both devices using two scsi paths (busses in this case)
wherby one chip transfers 1.5 megs per second interlaced into destination
buffer, and the other transfers 3 megs persecond interlaced in a
lockstepped manner during the data phases. ARRRGGH! 


Bill Williams