From: John P . Looney (valen at domain tuatha.org)
Date: Thu 23 Sep 1999 - 12:11:41 IST
I'm trying to work something out here.
PCI is supposed to be 32bit 33Mhz. That's 133 MB/sec, theoretical max.
SBUS (Sun's pre-pci bus) is 25MB/sec, proven.
The Sun Enterprise 10000, which is a modified cray machine uses SBus. I've
seen these machines with loads of gigabit network cards, fiberchannel cards
etc. plugged into them. What's the point, if you only get 25 MB/sec into
the machine ? Plug in a photon array (22 9GB or 18GB 10000RPM disks) - and
you plug it into a single 25MB/sec slot ? We are talking about only
allowing a little over 1MB/sec from each drive, if they are striped.
Something is really odd here. Is SBus really that bad, or does PCI
perform a lot worse under real conditions ?
OK, I know that Sun are shipping machines with 64bit 66Mhz PCI, but the
big iron machines aren't going to see that bus for two years or so...
-- Microsoft. The best reason in the world to drink beer.
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