[Bug 254513] virtio_random: random_harvestq spinning on a CPU with Q35 virtio random device

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From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 13 Jan 2022 04:03:28 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254513

--- Comment #37 from Kyle Evans <kevans@freebsd.org> ---
What's going on with Hetzner, at least, apparently has nothing to do with the
polling rate. we make it through exactly 0 iterations of vtrnd_harvest,
completely blocked in virtqueue_poll for the first time.

On this machine, vtrnd0 is hanging off of virtio_pci4:

virtio_pci4: <VirtIO PCI (modern) Entropy adapter> mem 0xfc800000-0xfc803fff
irq 22 at device 0.0 on pci5
vtrnd0: <VirtIO Entropy Adapter> on virtio_pci4

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