Hmm...well I must be doing something terribly wrong then. Our latencies are in the 140 microseconds range (as revealed by ping)
well, ping is not _really_ a benchmark ;) but it does sound like you have interrupt coalescing enabled. on our dl145g2 nodes (BCM95721), I can peel ~40 us off ping times by "ethtool -C eth1 rx-usecs 1". ping is also reporting round-trip, (MPI benchmarks quote half-rtt). also, ping is using 64B packets, not min-sized ones.
What's a typical debug protocol? What should I be checking for?
well, look at "ethtool -c" output and try with "ping -s 20". _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
