🚀 go-pugleaf

In article <WSD.90Feb22202840@pitman.cs.brown.edu> wsd@cs.brown.edu (Wm. Scott `Spot' Draves) writes:
>
>I read in Unix Today! that the new IBM RISCs used an improved MCA bus
>that doubled its performance from 20Mb/s to 40Mb/s.  There is a
>separate, higher performance, bus for memory.
>
>Isn't this quite underpowered relative to the CPU?  What sort of
>swapping performance can I expect?
>
>For comparison, the SS1's S-bus is 100Mb/s, I think.
>

You really need to have a look at the specifications of both buses.

In the case of the S-Bus you should read the specs.

	100 Mb/s @25Mhz "burst" thru' put for the S-Bus  

For the case of the S-Bus on a 16 2/3 Mhz bus, a'la SS1

	29 Mb/s @16 2/3Mhz "burst" thru' put (DMA)
	25 Mb/s @16 2/3Mhz "burst" thru' put (DVMA)

I would emphasis the the word "burst", you really need to have a close look
at the S-Bus specs in relation to the architecture of the machine with the
S-Bus.  The S-bus however is a nice and simple bus with a reasonabley high
thru' put. 


richard ..

#ps. any hints on the next line of Suns ? 
Richard Oxbrow			   |ACSnet	raob@mullian.oz
dept. of ee eng ,uni of melbourne  |Internet	raob@mullian.ee.mu.OZ.AU
parkville 3052 australia 	   |Arpa-relay  raob%mullian.oz@uunet.uu.net
fax   +[061][03]344 6678	   |Uunet	uunet!munnari!mullian!raob