On Mon, Jul 17, 2017 at 07:27:24 -0400, sferd...@redhat.com wrote: > From: Sahid Orentino Ferdjaoui <sahid.ferdja...@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: https://www.redhat.com/archives/libvir-list/2017-February/msg01048.html
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