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igc: Increase default per-queue interrupt rate to 20000.
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Authored by grehan on Jul 7 2023, 8:20 AM.
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Details

Summary

The default per-queue packet rate of 8000 will cause packet loss when
forwarding at 2.5G with a single stream, as is common when using e.g.
iperf3 to test a platform.

Bump this to 20000 (the "low latency" value in the Linux driver) which
avoids packet loss for this type of test.

Future work will use adaptive interrupt rate in a similar fashion
to the ixgbe driver.

Sponsored by: Rubicon Communications, LLC ("Netgate")

Test Plan

Forward iperf3 traffic through 2 igc ports at 2.5Gb/s

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rG FreeBSD src repository
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