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To: J Fieb who wrote (155)	11/22/1997 4:09:00 PM
From: George Dawson	Respond to of 4808

J Fieb, You are probably referring to the following excerpt: "By using network feedback with self-synchronizing communication schedules, the network-management system achieves synchronous I/O at all network interfaces. The network can therefore be scheduled for predictable performance without needing any specially designed QoS hardware. A prototype system has been demonstrated over Myricom's Myrinet network that showed synchronization overheads of less than 1 percent of the total communication traffic. The demonstration network achieved predictable latencies of 23 ms for an eight-node network, which Chien said was more than four times faster than conventional best-effort schemes that could achieve a predictable delay of only 104 ms." I think this is not great performance relative to a switched FC LAN. I think the developers would say this is a prototype and it will be cheaper than FC. These latency figures would lead to huge problems if you were sending large files or doing intensive calculations - but if time is not a big constraint you could probably use this system. Remember that part of the reason (in my opinion) that FC hasn't taken off yet, is that it presents (to most people) more performance than they need or more performance than their current nodes can handle. The recent releases of hybrid FC LANs and the Amoco release, using 1/4 speed FC switches points to that.