Intel IX4 Networking Performance On DragonFly Gets Boosted By Direct Input Support
Written by Michael Larabel in BSD on 24 September 2017 at 10:41 AM EDT. 1 Comment
BSD --
DragonFlyBSD today picked up direct input support within the kernel's polling code. This can boost the networking performance though for now is just supported by the IX4 driver, what is used as the Intel 10Gb Ethernet driver.

The commit explains:
When "direct input" is enabled by driver, driver's RX polling handler will run ethernet/ip/tcp processing directly, which avoids cache-miss on mbufs themselves. Currently it is enabled on ix(4) by default.

The normal IP forwarding performance is improved by %12, while the fast IP forwarding performance is improved by 10%. 13.2Mpps is achieved for dual side IP forwarding!

1 request/connection HTTP/1.1 performance and avg-latency stay same, but the latency is further stablized:
1K 5.20ms -> 4.60ms
8K 6.43ms -> 5.76ms
16K 16.30ms -> 14.90ms
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