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Ethernet The Occasional Outsider
coondoggie writes to mention an article at NetworkWorld about the outsider status of Ethernet in some high-speed data centers. From the article: "The latency of store-and-forward Ethernet technology is imperceptible for most LAN users -- in the low 100-millisec range. But in data centers, where CPUs may be sharing data in memory across different connected machines, the smallest hiccups can fail a process or botch data results. 'When you get into application-layer clustering, milliseconds of latency can have an impact on performance,' Garrison says. This forced many data center network designers to look beyond Ethernet for connectivity options."
I, for one, welcome our new non-ethernet overlords.
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I have a cluster of 45 dual Xeon processing nodes. Latencies average about 210 usec the same as could be expected in any 100Mbs connection, but using channel bonding my bandwidth is double that of a single ethernet connection. I don't have the need for faster, all our processes are wholly independent and don't need to do message passing.