On Mon, Feb 11, 2019 at 09:52:01AM -0500, Michael S. Tsirkin wrote: > On Mon, Feb 11, 2019 at 04:40:44PM +0300, Anton Kuchin wrote: > > As far as I can see currently IOThread offloading is used only for block > > devices and all others are emulated by main thread. > > > > I expect that network devices can also benefit from processing in separate > > thread but I couldn't find any recent work in this direction. I'm going to > > implement a PoC but I want to ask if you know any previous attempts and do > > you know why it can be a total waste of time. Are there fundamental > > obstacles that prevent network emulation handling in IOThread? > > No but vhost-net is there. Unlike block where you gain lots of > functionality such as snapshots there seems to be little to > be gained by doing it in userspace.
Anthony Liguori tried virtio-net in a dedicated thread a long time ago but it was never completed/merged. I think the argument for vhost-net in the kernel is that userspace doesn't offer the same APIs as the kernel. For example, is zero copy possible from userspace? Anton: If you want to do virtio-net in userspace, QEMU has vhost-user-net support so you can perform emulation in a separate process. Stefan
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