Using data from the PerfSonar network throughput testing node at Langston University (LU) the state Regional Optical Network provider OneNet was able to influence ESNET at LU's request to change the MTU of the Kansas-Oklahoma border router to 9000, matching the MTU of the LU HPC cluster (Lucille) 10GE NICs. That change resulted in about a 10-15% improvement in bandwidth in one direction, as determined by PerfSonar testing. This change came on top of a change in networking parameters at Lucille in August 2015 (as recommended at fasterdata.es.net) that provided a 50% improvement in bandwidth to/from many USATLAS Tier 2 sites as determined by PerfSonar testing.
Clearly visible in the plots below is the effect of the implementation
on August 10, 2015 of recommendations
to improve throughput on lutgw1 and lutse1 external NICs. Also
visible on the BNL/LU plot on September 1, 2015 is the effect of
changing the MTU of the Kansas-Oklahoma border router to 9000 by ESNet
at the urging of OneNet because of LU's request for the change. The
mismatch was found as a result of PerfSonar monitoring.