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

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

Evilham <contact at evilham.com> changed:

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                 CC|                            |contact at evilham.com

--- Comment #2 from Evilham <contact at evilham.com> ---
\o Hello, just wanted to bump this a bit and provide some more information:

This is happening in 13.0-RELEASE also virtualised under kvm/qemu, which I
didn't catch until now due to only having tested on hardware.

With CPU being busy with rand_harvestq, things were incredibly slow, so, as a
non-reboot work around, I did:

mv /boot/kernel/virtio_random.ko{,.disabled}
kldunload virtio_random

(Mina's suggestion is better as it survives a reboot)

Which actually allows me to use the VM meanwhile.

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