David Leimbach writes: > True... I guess I didn't state my case clearly enough that I think IP > over firewire > is in itself a good thing for clusters.
>From my experience with the Apple IP over Firewire, it seems slow, and very high overhead. A dual 800MHz G4 host which can transmit at well over 1 Gb/sec (using ethernet-over-Myrinet) maxes its CPU out at 200Mb/sec, or less with IP over Firewire. (I'd report GigE numbers, but I don't have a GigE switch or a decent enough cable to get a host-host link at 1Gb/s). Its possible that the Apple code just sucked, I don't know. It used a 1500 byte mtu, for example. I'd have thought you'd be able to have much large mtus w/firewire. If the Apple code is typical, then I think that unless you've got some sort of alternate zero-copy protocol running over raw firewire, you'd be better off running GigE, or even multiple 100Mb links. Drew To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
