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Old 07-16-2014, 08:01 AM   #1
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Multicast drops as data rate is "lowered"??????

I am sending 20 channels of data via multicast. The data bucket size is 28000 bytes and each channel sends at around 3 milliseconds. Data is sent via 10GBe. Each channel has it's own multicast group. This gives me a total throughput of a little under 380MB/sec. With this configuration, I see multicast messages being dropped.

When I turn the send rate down to 1 millisecond, thus almost trippling the data rate, I see absolutely no drops at all. 1.03GB/second. This makes no sense to me. The slower I send the data packets, the more I drop.

System is openSuse13.1 with noapi and acpi=off running stock 3.11 kernel. Application priorities are all elevated to RT priority using the RR scheduler.

I have tried this with both a pair of QLogic cards and Chelsio cards. The QLogic cards perform MUCH better, but still exhibit the same problem. I am using boost ASIO, but have also observed this with RTIDDS as well.

Thanks for any info you may have.... or at minimum a direction to go looking...



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