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<div>Hi All,</div>
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<div> Beam in Hall-B was unexpectedly down for a couple of hours this morning so I took advantage and</div>
<div>ran som bandwidth tests to the ejfat-fs-daq node from clonfarm21sro. I cut and pasted some of the</div>
<div>details into a wiki page at the link below. Here is the summary of what I found:</div>
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<li style="margin-bottom: 0.1em;">iperf3 does not report rates as high as iperf(2)
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<li style="margin-bottom: 0.1em;">(I copied /usr/bin/iperf from efat-fs-daq to a temporary directory on clonfarm21sro to use it)</li></ul>
</li><li style="margin-bottom: 0.1em;">Can achieve 99Gbps between ejfat-2 and ejfat-fs-daq</li><li style="margin-bottom: 0.1em;">Can achieve 75Gbps between clonfarm21sro and ejfat-fs-daq
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<li style="margin-bottom: 0.1em;">n.b. 75Gbps is a reasonably reliable average, but it fluctuates. The highest I saw was just over 80Gbps, but not sustained.</li></ul>
</li><li style="margin-bottom: 0.1em;">UDP is very limited (~1Mbps/thread). Possibly due to maximum allowed packet size on the system.</li><li style="margin-bottom: 0.1em;">Routing from ejfat-fs-daq to clonfarm21sro is broken so only connections initiated from clonfarm21sro can be made at the moment.</li></ol>
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<div>The wiki page has exact commands run which include window and buffer sizes as well as number of</div>
<div>streams.</div>
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<div><a href="https://wiki.jlab.org/epsciwiki/index.php/Hall-B_to_EJFat_transfer_speeds">https://wiki.jlab.org/epsciwiki/index.php/Hall-B_to_EJFat_transfer_speeds</a><br>
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Regards,<br>
-David<br>
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-------------------------------------------------------------<br>
David Lawrence Ph.D.</div>
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Staff Scientist - - EPSCI Group Lead<br>
Thomas Jefferson National Accelerator Facility<br>
Newport News, VA<br>
davidl@jlab.org<br>
(757) 269-5567 W<br>
(757) 746-6697 C<br>
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