Hi folks A partner is rebuilding a beowulf rendering/post-production cluster, and they swapped out some smaller switches for a larger Cisco 6509 switch frame. They are encountering some issues, asked us for help. Unfortunately, I know very little about these switches and IOS (not the Apple bit), so I am hoping to get a pointer to what we should be looking for. If anyone is an IOS/Cisco expert that can help today, please contact me offlist.
Here's the problem: iperf between 2 nodes, wire speed. 117 MB/s. iperf between 4 nodes, 1/2 wire speed, or 55 MB/s. As they increase the number of pairs doing iperf, performance keeps dropping. This suggests that all traffic is being serialized somehow, possibly transiting a single interface. Anyone out there ever see something like this before? Any clues as to how to handle it? Or how to diagnose/fix this? Thanks in advance. Joe -- Joseph Landman, Ph.D Founder and CEO Scalable Informatics Inc. email: land...@scalableinformatics.com web : http://scalableinformatics.com http://scalableinformatics.com/sicluster phone: +1 734 786 8423 x121 fax : +1 866 888 3112 cell : +1 734 612 4615 _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
