On Fri, Dec 13, 2013 at 01:04:58PM +0100, Vincenzo Maffione wrote:
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
Vincenzo Maffione (5):
net: extend NetClientInfo for offloading manipulations
net: TAP uses NetClientInfo offloading callbacks
net: virtio-net and vmxnet3 use offloading API
net: add offloadings support to netmap backend
net: virtio-net and vmxnet3 can use netmap offloadings
hw/net/virtio-net.c | 16 +-
hw/net/vmxnet3.c| 12 +-
include/net/net.h | 19
net/net.c | 55 +
net/netmap.c| 64
-
net/tap.c | 6 +
6 files changed, 154 insertions(+), 18 deletions(-)
Overall I'm happy with the approach. I left comments about cleaning up
the tap interface that you're moving to NetClient, and about supporting
runtime offload feature toggling.
