On Mon, Feb 24, 2014 at 05:14:04PM +0100, Luke Gorrie wrote: > On 24 February 2014 16:20, Stefan Hajnoczi <stefa...@gmail.com> wrote: > > > Do you want the 1:1 mapping to achieve best performance or just to > > simplify the coding? > > > > We want to keep the real-time constraints on the data plane comfortable. > > The question I ask myself is: How long can I buffer packets during > processing before something is dropped? > > 256 buffers can be consumed in 17 microseconds on a 10G interface.
This is a good point. The virtio-net vring is too small at 256 buffers for workloads that want to send/receive small packets at 10 Gbit/s line rate. (Minimum UDP packet size is 52 bytes!) Michael: Luke has asked to increase the virtio-net virtqueue size. Thoughts? Stefan
