Re: [pve-devel] [PATCH v3 qemu-server 10/10] RFC: add multiple iothreads support

[Fiona Ebner <f.ebner@proxmox.com>]

Am 22.08.25 um 4:18 PM schrieb Alexandre Derumier:
> +    iothreads => {
> +        optional => 1,
> +        type => 'string',
> +        verbose_description =>
> +            "Create multiple iothreads and share them between disks where iothread is enabled."
> +            . "Iothreads can be optionally pinned to specific host cpu. (Ideally on different"
> +            . "host cores than the vm vcpus)",
> +        description => "Multiple iothreads configuration.",
> +        format => $PVE::QemuServer::DriveDevice::iothreads_fmt,
> +    },

Multiple iothreads in particular means that block jobs might be
executing in more different threads than before. There might be buggy
edge cases/races lurking. This came up recently (see the lower half of
[0]), so I'd like to start out with stating that this feature is a tech
preview in the schema description. We can drop this label later if
nothing actually comes up.

[0]: https://lore.kernel.org/qemu-devel/aYTE9hf0mMTOUUTJ@redhat.com/