iperf tests with default window size to stargrid03.rcf.bnl.gov,
stargrid04.rhic.bnl.gov from pdsfgrid4.nersc.gov.  Single thread.

Summary:
stargrid03:  ~840 kB/s, very steady
stargrid04:  5.7 MB/s net

pdsfgrid4 32% iperf -c stargrid03.rcf.bnl.gov -t 1000 -i 10 -p 21000 -P 1
------------------------------------------------------------
Client connecting to stargrid03.rcf.bnl.gov, TCP port 21000
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  5] local 128.55.24.29 port 41027 connected with 130.199.6.56 port 21000
[  5]  0.0-10.0 sec  8.19 MBytes  6.87 Mbits/sec
[  5] 10.0-20.0 sec  8.34 MBytes  6.99 Mbits/sec
[  5] 20.0-30.0 sec  8.35 MBytes  7.01 Mbits/sec
[  5] 30.0-40.0 sec  8.39 MBytes  7.04 Mbits/sec
[  5] 40.0-50.0 sec  8.39 MBytes  7.04 Mbits/sec
[  5] 50.0-60.0 sec  7.91 MBytes  6.64 Mbits/sec
[  5] 60.0-70.0 sec  8.34 MBytes  6.99 Mbits/sec
[  5] 70.0-80.0 sec  8.35 MBytes  7.01 Mbits/sec
[  5] 80.0-90.0 sec  8.38 MBytes  7.03 Mbits/sec
[  5] 90.0-100.0 sec  8.34 MBytes  6.99 Mbits/sec
[  5] 100.0-110.0 sec  8.36 MBytes  7.01 Mbits/sec
[  5] 110.0-120.0 sec  6.68 MBytes  5.60 Mbits/sec
[  5] 120.0-130.0 sec  8.41 MBytes  7.06 Mbits/sec
[  5] 130.0-140.0 sec  8.35 MBytes  7.01 Mbits/sec
[  5] 140.0-150.0 sec  8.38 MBytes  7.03 Mbits/sec


pdsfgrid4 34% iperf -c stargrid04.rhic.bnl.gov -t 1000 -i 10 -p 21000 -P 1
------------------------------------------------------------
Client connecting to stargrid04.rhic.bnl.gov, TCP port 21000
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  5] local 128.55.24.29 port 41031 connected with 130.199.80.179 port 21000
[  5]  0.0-10.0 sec  19.5 MBytes  16.3 Mbits/sec
[  5] 10.0-20.0 sec  34.1 MBytes  28.6 Mbits/sec
[  5] 20.0-30.0 sec  48.0 MBytes  40.3 Mbits/sec
[  5] 30.0-40.0 sec  32.2 MBytes  27.0 Mbits/sec
[  5] 40.0-50.0 sec  28.7 MBytes  24.0 Mbits/sec
[  5] 50.0-60.0 sec  21.9 MBytes  18.4 Mbits/sec
[  5] 60.0-70.0 sec  34.4 MBytes  28.8 Mbits/sec
[  5] 70.0-80.0 sec  47.5 MBytes  39.9 Mbits/sec
[  5] 80.0-90.0 sec  37.0 MBytes  31.0 Mbits/sec
[  5] 90.0-100.0 sec  19.7 MBytes  16.5 Mbits/sec
[  5] 100.0-110.0 sec  35.2 MBytes  29.5 Mbits/sec
[  5] 110.0-120.0 sec  48.2 MBytes  40.4 Mbits/sec
[  5] 120.0-130.0 sec  62.0 MBytes  52.0 Mbits/sec
[  5] 130.0-140.0 sec  42.1 MBytes  35.3 Mbits/sec
[  5] 140.0-150.0 sec  46.6 MBytes  39.1 Mbits/sec
[  5] 150.0-160.0 sec  22.3 MBytes  18.7 Mbits/sec
[  5] 160.0-170.0 sec  35.6 MBytes  29.8 Mbits/sec
[  5] 170.0-180.0 sec  35.0 MBytes  29.3 Mbits/sec
[  5] 180.0-190.0 sec  38.0 MBytes  31.9 Mbits/sec
[  5] 190.0-200.0 sec  51.5 MBytes  43.2 Mbits/sec
[  5] 200.0-210.0 sec  37.9 MBytes  31.8 Mbits/sec
[  5] 210.0-220.0 sec  26.9 MBytes  22.6 Mbits/sec
[  5] 220.0-230.0 sec  38.7 MBytes  32.4 Mbits/sec
[  5] 230.0-240.0 sec  52.1 MBytes  43.7 Mbits/sec
[  5] 240.0-250.0 sec  65.6 MBytes  55.0 Mbits/sec
[  5] 250.0-260.0 sec  78.6 MBytes  66.0 Mbits/sec
[  5] 260.0-270.0 sec  92.7 MBytes  77.8 Mbits/sec
[  5] 270.0-280.0 sec  63.1 MBytes  52.9 Mbits/sec
[  5] 280.0-290.0 sec  49.8 MBytes  41.8 Mbits/sec
[  5] 290.0-300.0 sec  25.9 MBytes  21.8 Mbits/sec
[  5] 300.0-310.0 sec  39.0 MBytes  32.7 Mbits/sec
[  5] 310.0-320.0 sec  52.9 MBytes  44.4 Mbits/sec
[  5] 320.0-330.0 sec  65.9 MBytes  55.2 Mbits/sec
[  5] 330.0-340.0 sec  79.4 MBytes  66.6 Mbits/sec
[  5] 340.0-350.0 sec  92.9 MBytes  78.0 Mbits/sec
[  5] 350.0-360.0 sec    106 MBytes  89.3 Mbits/sec
[  5] 360.0-370.0 sec    120 MBytes    101 Mbits/sec
[  5] 370.0-380.0 sec  87.8 MBytes  73.6 Mbits/sec
[  5] 380.0-390.0 sec  81.6 MBytes  68.5 Mbits/sec
[  5] 390.0-400.0 sec  95.0 MBytes  79.7 Mbits/sec
[  5] 400.0-410.0 sec    108 MBytes  90.4 Mbits/sec
[  5] 410.0-420.0 sec  43.6 MBytes  36.6 Mbits/sec
[  5] 420.0-430.0 sec  45.3 MBytes  38.0 Mbits/sec
[  5] 430.0-440.0 sec  33.1 MBytes  27.8 Mbits/sec
[  5] 440.0-450.0 sec  46.6 MBytes  39.1 Mbits/sec
[  5] 450.0-460.0 sec  60.2 MBytes  50.5 Mbits/sec
[  5] 460.0-470.0 sec  64.1 MBytes  53.8 Mbits/sec
[  5] 470.0-480.0 sec  48.4 MBytes  40.6 Mbits/sec
[  5] 480.0-490.0 sec  62.0 MBytes  52.0 Mbits/sec
[  5] 490.0-500.0 sec  75.2 MBytes  63.1 Mbits/sec
[  5] 500.0-510.0 sec  88.9 MBytes  74.6 Mbits/sec
[  5] 510.0-520.0 sec    102 MBytes  85.4 Mbits/sec
[  5] 520.0-530.0 sec    115 MBytes  96.8 Mbits/sec
[  5] 530.0-540.0 sec    129 MBytes    108 Mbits/sec
[  5] 540.0-550.0 sec    118 MBytes  98.8 Mbits/sec
[  5] 550.0-560.0 sec  83.2 MBytes  69.8 Mbits/sec
[  5] 560.0-570.0 sec  96.8 MBytes  81.2 Mbits/sec
[  5] 570.0-580.0 sec    111 MBytes  92.9 Mbits/sec
[  5] 580.0-590.0 sec    124 MBytes    104 Mbits/sec
[  5] 590.0-600.0 sec  61.1 MBytes  51.3 Mbits/sec
[  5] 600.0-610.0 sec  50.0 MBytes  41.9 Mbits/sec
[  5] 610.0-620.0 sec  63.4 MBytes  53.2 Mbits/sec
[  5] 620.0-630.0 sec  56.3 MBytes  47.2 Mbits/sec
[  5] 630.0-640.0 sec  36.9 MBytes  31.0 Mbits/sec
[  5] 640.0-650.0 sec  36.3 MBytes  30.5 Mbits/sec
[  5] 650.0-660.0 sec  19.2 MBytes  16.1 Mbits/sec
[  5] 660.0-670.0 sec  26.5 MBytes  22.3 Mbits/sec
[  5] 670.0-680.0 sec  27.2 MBytes  22.8 Mbits/sec
[  5] 680.0-690.0 sec  40.6 MBytes  34.1 Mbits/sec
[  5] 690.0-700.0 sec  54.0 MBytes  45.3 Mbits/sec
[  5] 700.0-710.0 sec  67.8 MBytes  56.8 Mbits/sec
[  5] 710.0-720.0 sec  80.8 MBytes  67.8 Mbits/sec
[  5] 720.0-730.0 sec  94.4 MBytes  79.2 Mbits/sec
[  5] 730.0-740.0 sec  58.8 MBytes  49.4 Mbits/sec
[  5] 740.0-750.0 sec  70.6 MBytes  59.2 Mbits/sec
[  5] 750.0-760.0 sec  84.1 MBytes  70.6 Mbits/sec
[  5] 760.0-770.0 sec  96.9 MBytes  81.3 Mbits/sec
[  5] 770.0-780.0 sec    111 MBytes  92.9 Mbits/sec
[  5] 780.0-790.0 sec  57.5 MBytes  48.2 Mbits/sec
[  5] 790.0-800.0 sec  38.6 MBytes  32.4 Mbits/sec
[  5] 800.0-810.0 sec  22.0 MBytes  18.4 Mbits/sec
[  5] 810.0-820.0 sec  29.3 MBytes  24.6 Mbits/sec
[  5] 820.0-830.0 sec  25.3 MBytes  21.2 Mbits/sec
[  5] 830.0-840.0 sec  37.7 MBytes  31.6 Mbits/sec
[  5] 840.0-850.0 sec  51.2 MBytes  43.0 Mbits/sec
[  5] 850.0-860.0 sec  57.1 MBytes  47.9 Mbits/sec
[  5] 860.0-870.0 sec  44.1 MBytes  37.0 Mbits/sec
[  5] 870.0-880.0 sec  56.8 MBytes  47.7 Mbits/sec
[  5] 880.0-890.0 sec  71.3 MBytes  59.8 Mbits/sec
[  5] 890.0-900.0 sec  46.1 MBytes  38.7 Mbits/sec
[  5] 900.0-910.0 sec  58.6 MBytes  49.2 Mbits/sec
[  5] 910.0-920.0 sec  71.1 MBytes  59.7 Mbits/sec
[  5] 920.0-930.0 sec  45.6 MBytes  38.3 Mbits/sec
[  5] 930.0-940.0 sec  59.5 MBytes  49.9 Mbits/sec
[  5] 940.0-950.0 sec  73.1 MBytes  61.4 Mbits/sec
[  5] 950.0-960.0 sec  70.2 MBytes  58.9 Mbits/sec
[  5] 960.0-970.0 sec  55.7 MBytes  46.7 Mbits/sec
[  5] 970.0-980.0 sec  36.4 MBytes  30.5 Mbits/sec
[  5] 980.0-990.0 sec  29.1 MBytes  24.4 Mbits/sec
[  5] 990.0-1000.0 sec  42.0 MBytes  35.2 Mbits/sec
[  5]  0.0-1000.0 sec  1.72 GBytes  14.8 Mbits/sec