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Re: [libvirt] [PATCHv2 0/3] exposing busy polling support for vhost-net

On Mon, Jul 17, 2017 at 07:27:24 -0400, sferdjao redhat com wrote:
> From: Sahid Orentino Ferdjaoui <sahid ferdjaoui redhat com>
> In version 2.7.0, QEMU introduced support of busy polling for
> vhost-net [0]. To avoid paraphrasing original authors of that feature
> and the purpose it I prefer to share a pointer [1].
> This patch serie exposes throught the NIC driver-specific element a
> new option 'poll_us'. That option is only available with the backend
> driver 'vhost' and that because libvirt automatically fallback to QEMU
> if the driver is not specified where that option is not available.
> The option 'poll_us' takes a positive. 0 means that the option
> is not going to be exposed.

We had a similar attempt to do this for disk polling, but that was
rejected since it's not very straightforward for the users to tune this
variable. I think this falls into the same category.

Here's the discussion for iothread polling:


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