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QEMU networking has some knobs that would be interesting to be in control of.

Those include tx mitigation on/off, number of vhost threads, etc.
Would be good to have a supported libvirt way to pass them to qemu.

Some related work that is settling the upstream debate is being done upstream this week.  These knobs would slot into that work nicely.

(The upstream work for adding the sndbuf tunable (which is generic to all tap-based network devices) is detailed in Bug 665293. The work for adding a selection of vhost vs. userland backend (which is specific to virtio) is in Bug 643050.)

Where are these other knobs documented? I see nothing in the qemu -help output (of 0.13.0, at least).

so, are there any other network controls you want to have exposed? Can you please enumerate them?

and as laine pointed out - could you please link docs where are these knobs documented? i've tried 0.14.0-rc0 and the changes are also only minor.