ixg(4) performance issues with a NetBSD-10 VM

To: "netbsd-users%netbsd.org@localhost" <netbsd-users%netbsd.org@localhost>
Subject: ixg(4) performance issues with a NetBSD-10 VM
From: Sad Clouds <cryintothebluesky%gmail.com@localhost>
Date: Tue, 2 Dec 2025 16:26:06 +0000

I'm using a few NetBSD-10 VMs as FreeBSD Bhyve guests. For network
interfaces I'm doing device passthrough, which appear in NetBSD VM as
ixg(4) interfaces.

The problem is network throughput is not great. With 10 GbE Intel NIC
and MTU of 9000 bytes and all offload capabilities enabled, I get this:
send at 4 Gb/sec and receive at 1.3 Gb/sec.

Same setup with FreeBSD VM gives me 9 Gb/sec for both send and receive.

Has anyone seen similar performance issues with ixg(4) driver? Or can
recommend sysctl tuning for 10 GbE NIC?

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