Luke, I might have a similar problem... I am wondering if you end up increasing the ring buffer size yourself.
My problem is on the tx side. When sending many small udp packets, I am seeing "outgoing packets dropped" in "netstat -s" increase quickly. Increasing txqueue of the interface and wmem size in sysctl doesn't seem to help at all. tx ring size is what I am looking at now. My VM however is connected to a bridge and then to OpenVSwitch - so I might have other bottlenecks... Thanks! On Friday, February 14, 2014 at 8:43:14 AM UTC-5, Luke Gorrie wrote: > > Howdy! > > Observation: virtio-net.c hard-codes the vring size to 256 buffers. > > Could this reasonably be made configurable, or would that be likely to > cause a problem? > > In Snabb Switch we are creating a 1:1 mapping between Virtio-net > descriptors and VMDq hardware receive descriptors. The VMDq queues support > 32768 buffers and I'd like to match this on the QEMU/Virtio-net side -- or > at least come close. > > Cheers! > -Luke > > >
