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You can find more details about this option here: Intel Whitepaper - Open Source Kernel Enhancements for Low-Latency Sockets using Busy Poll

Linux kernel support:

Kernel should be built with CONFIG_NET_RX_BUSY_POLL compilation option which is enabled by default in RHEL 7.x, no changes are needed for this OS.



Note that SO_BUSY_POLL socket option is supported only by FIX Antenna 2.15.0 C++ and higher.

Test Results

A modified Benchmark/Latency test was used in these tests. There were inserted 10ms delays between posts to make the test more realistic and the message rate similar to what occurs in practice. Number of messages = 1000.

The test was conducted on RHEL7.1i7 3.6 GHz CPUMyricom 10G NICs; packages were passed through 10G cross-over cableeverything was installed on a single machine.

  1. SO_BUSY_POLL is enabled using SocketBusyPollTime. This is a new mode.

    Code Block
    languagebash = 600000 = 500
    iterations = 1,000

    Total latency (nanoseconds):   <- time from sending till receiving the message
    MIN: 13549
    MAX: 130952
    AVG: 16396

  2. SO_BUSY_POLL is disabled.
    Total latency (nanoseconds):
    MIN: 39530
    MAX: 166082
    AVG: 47499

  3. SO_BUSY_POLL is disabled, but “busy poll” is enabled inside of Antenna using installation.

    Code Block
    languagebash = 0

    Total latency (nanoseconds):
    MIN: 15854
    MAX: 123549
    AVG: 18831