Can we get a list of the Modules in the Switch? I'd be willing to bet they don't have an MSFC card, and are just using the SUP module
On Wed, Jun 15, 2011 at 10:27 AM, Joe Landman <land...@scalableinformatics.com> wrote: > 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 > _______________________________________________ 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
