The purpose of this patch series is to add offloadings support (TSO/UFO/CSUM) to the netmap network backend, and make it possible for the paravirtual network frontends (virtio-net and vmxnet3) to use it. In order to achieve this, these patches extend the existing net.h interface to add abstract operations through which a network frontend can manipulate backend offloading features, instead of directly calling TAP-specific functions.
Guest-to-guest performance before this patches for virtio-net + netmap: TCP_STREAM 5.0 Gbps TCP_RR 12.7 Gbps UDP_STREAM (64-bytes) 790 Kpps Guest-to-guest performance after this patches for virtio-net + netmap: TCP_STREAM 21.4 Gbps TCP_RR 12.7 Gbps UDP_STREAM (64-bytes) 790 Kpps Experiment details: - Processor: Intel i7-3770K CPU @ 3.50GHz (8 cores) - Memory @ 1333 MHz - Host O.S.: Archlinux with Linux 3.11 - Guest O.S.: Archlinux with Linux 3.11 - QEMU command line: qemu-system-x86_64 archdisk.qcow -snapshot -enable-kvm -device virtio-net-pci,ioeventfd=on,mac=00:AA:BB:CC:DD:01,netdev=mynet -netdev netmap,ifname=vale0:01,id=mynet -smp 2 -vga std -m 3G ******** Changes against the previous version *********** (1) make tap offloading callbacks static (2) tap-win32.c modified to initialize offloading callback pointers (3) fix a bug when calling qemu_peer_using_vnet_header Vincenzo Maffione (6): net: change vnet-hdr TAP prototypes net: extend NetClientInfo for offloading net: TAP uses NetClientInfo offloading callbacks net: virtio-net and vmxnet3 use offloading API net: make tap offloading callbacks static net: add offloading support to netmap backend hw/net/vhost_net.c | 4 +-- hw/net/virtio-net.c | 16 ++++------ hw/net/vmxnet3.c | 12 +++---- include/net/net.h | 19 +++++++++++ include/net/tap.h | 6 ---- net/net.c | 55 ++++++++++++++++++++++++++++++++ net/netmap.c | 68 ++++++++++++++++++++++++++++++++++++++- net/tap-win32.c | 92 ++++++++++++++++++++++++++++------------------------- net/tap.c | 20 ++++++++---- 9 files changed, 216 insertions(+), 76 deletions(-) -- 1.8.5.3