[openib-general] Multicast traffic performace of OFED 1.0 ipoib

[Michael Krause]

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.

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.

Mike



At 04:30 AM 8/2/2006, Moni Levy wrote:
>Hi,
>     we are doing some performance testing of multicast traffic over
>ipoib. The tests are performed by using iperf on dual 1.6G AMD PCI-X
>servers with PCI-X Tavor cards with 3.4.FW.  Below are the command the
>may be used to run the test.
>
>Iperf server:
>route add -net 224.0.0.0 netmask 240.0.0.0 dev ib0
>/home/qa/testing-tools/iperf-2.0.2/iperf -us -B 224.4.4.4 -i 1
>
>Iperf client:
>route add -net 224.0.0.0 netmask 240.0.0.0 dev ib0
>/home/qa/testing-tools/iperf-2.0.2/iperf -uc 224.4.4.4 -i 1 -b 100M -t
>400 -l 100
>
>We are looking for the max PPT rate (100 byte packets size) without
>losses, by changing the BW parameter and looking at the point where we
>get no losses reported. The best results we received were around 50k
>PPS. I remember that we got some 120k-140k packets of the same size
>running without losses.
>
>We are going to look into it and try to see where is the time spent,
>but any ideas are welcome.
>
>Best regards,
>Moni
>
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