UDP traffic, msg size exceeds 9215 Bytes

Meny Yossefi menyy at mellanox.com
Thu Nov 28 12:46:34 UTC 2013

Hi all,

We've been running some benchmarks (Netperf, Iperf) on our driver (Mellanox), and witnessed an odd behavior.
We saw that when running UDP traffic with msg size larger than 9215 bytes, it gets dropped for some reason. MTU is 1500.

We've spotted the same behavior on different vendors which lead us to believe there's some kernel issue that we are missing here.

Please advise,
Meny Yossefi | SW Engineer
Mellanox Technologies Ltd
Work: +972-74-7129121, Cell: +972-52-8379557

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