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Is the performance being measured on an identical topology and hardware
set as before? Multicast by its very nature is sensitive to
topology, hardware components used (buffer depth, latency, etc.) and
workload occurring within the fabric. Loss occurs as a function of
congestion or lack of forward progress resulting in a timeout and thus a
toss of a packet. If the hardware is different or the
settings chosen are changed, then the results would be expected to
change. <br><br>
It is not clear what you hope to achieve with such tests as there will be
other workloads flowing over the fabric which will create random HOL
blocking which can result in packet loss. Multicast workloads
should be tolerant of such loss. <br><br>
Mike<br><br>
<br><br>
At 04:30 AM 8/2/2006, Moni Levy wrote:<br>
<blockquote type=cite class=cite cite="">Hi,<br>
we are doing some performance testing of multicast
traffic over<br>
ipoib. The tests are performed by using iperf on dual 1.6G AMD PCI-X<br>
servers with PCI-X Tavor cards with 3.4.FW. Below are the command
the<br>
may be used to run the test.<br><br>
Iperf server:<br>
route add -net 224.0.0.0 netmask 240.0.0.0 dev ib0<br>
/home/qa/testing-tools/iperf-2.0.2/iperf -us -B 224.4.4.4 -i 1<br><br>
Iperf client:<br>
route add -net 224.0.0.0 netmask 240.0.0.0 dev ib0<br>
/home/qa/testing-tools/iperf-2.0.2/iperf -uc 224.4.4.4 -i 1 -b 100M
-t<br>
400 -l 100<br><br>
We are looking for the max PPT rate (100 byte packets size) without<br>
losses, by changing the BW parameter and looking at the point where
we<br>
get no losses reported. The best results we received were around 50k<br>
PPS. I remember that we got some 120k-140k packets of the same size<br>
running without losses.<br><br>
We are going to look into it and try to see where is the time spent,<br>
but any ideas are welcome.<br><br>
Best regards,<br>
Moni<br><br>
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