🚀 go-pugleaf

TYPO CORRECTION TIME....

In article <1991Sep5.224731.1555@unislc.uucp> martin@unislc.UUCP (Martin Cryer,D1Z01,5754) writes:

>In article <1991Sep1.195029.16374@aber.ac.uk> pcg@aber.ac.uk (Piercarlo Grandi) writes:
>>scogen@xenitec.on.ca (scogen@xenitec.on.ca) writes:
>>
>>> We are trying to configure an SCO Unix system running some type of
>>> IP, (maybe TCP, maybe UPD) to operate at maximum throughput. Our goal
>>> is to get up to _6_ Megabits/Sec.

sorry I read this as megabyte / s originally!
		         ^^^^
I blame my bad eyesight and this darned X windows font!

>>
>>Well, nearly any modern Ethernet card will deliver 6 Megabits per second.
>>After all it's only around 600KB/s. SCO's TCP protocol stack will most
>>probably not be able to keep up with the card though.
>>
>EISA will give you 32bit DMA address space, so your drivers can (if
>nicely written), give you DMA from user space to controller (or controller
>to user space) without copying, whatever your memory size. This is
>especially important for high volume disk i/o on SVR4 where the
>buffer cache is through the normal VM page fault / free page pool
>mechanism and can therefore come potentially from any real memory
>address (and not just below 16MB where the SVR4 buffer cache is likely to be).

Sorry this should say SVR3 here             ^^^^

Martin Cryer
Unisys Europe Africa
Unix SVR4 Development
Unisys Salt Lake City

All opinions are my own and not those of my employer.