Single thread iperf test from pdsfgrid5.nersc.gov to stargrid04.nersc.gov (3/10/05)
TCP parameters for this test.

Summary:  ipchains settings on pdsfgrid5 have been restored.
                 Performance is the similar to previous, ~ 20 kB/s.
                 Connection now uses .rhic.gov instead of .rcf.gov for stargrid04.

Single thread iperf tests from pdsfgrid4.nersc.gov to 2 RCF nodes (3/6/05)
Single thread iperf tests from pdsfgrid5.nersc.gov to 2 RCF nodes (3/7/05)
Single thread iperf tests from pc1632.nersc.gov to 2 RCF nodes (3/6/05)
TCP parameters for the 5 nodes in these tests.  In a table for easier comparisons.

Summary:  800kB/s from pdsfgrid4, pc1632 to stargrid03
                ~5 MB/s from pdsfgrid4, pc1632 to stargrid04
                 25 kB/s from pdsfgrid5 to stargrid03, stargrid05
.                TCP parameters are different on all 5 nodes.

Single thread iperf tests from pdsfgrid4 to 2 RCF nodes (2/22/05)
Single thread iperf tests from pdsfgrid5 to 2 RCF nodes (2/22/05)
Single thread iperf tests from pc1632 to 2 RCF nodes (2/22/05)

These tests done 2/22/05.  Some changes on RCF nodes (?).  PDSF nodes have txqueuelen changed to 1000 for pdsfgrid4,
still at 100 for pdsfgrid5, set at 1000 for pc1632.

Single thread iperf tests from pdsfgrid4 to 3 RCF gridnodes (2/14/05)
Single thread iperf tests from pdsfgrid5 to 3 RCF gridnodes (2/14/05)
 
Performance is similar between pdsfgrid4 and pdsfgrid5.  Default window size is different for the two nodes (85 kB vs. 64 kB).

Performance varies dramatically between stargrid01, 03 and 04.  stargrid03 is the worst at about 840 kB/s.  stargrid04 is the best with rates of up to 40 MB/s observed when using pdsfgrid5.  stargrid01 is somewhere in between with rates of 6-10 MB/s.  This seems to suggest that window scaling is not working at all on stargrid03 but is working at least to some degree on the other nodes (window scaling confirmed to netqos02.bnl.org by Shane and others with Dantong.  They also observed 20 MB/s.).  Setting the window size larger with the iperf -w option doesn't seem to have much effect.  These tests have been repeated over a period of days and seem quite reproduceable.

Note:  Connecting from pdsfgrid4 to stargrid04 required using stargrid04.rhic.bnl.gov.
Connecting from pdsfgrid5 required using stargrid04.rcf.bnl.gov.