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 ***********
NOTE: Now the VALE switch supports the offloadings, meaning that TCP/UDP will
work
even between a virtio-net guest with offloadings enabled and another
guest with offloadings disabled. This has been achieved without
performance loss
on the "fast" case (e.g. two virtio-net-guest communicating with
offloadings on).
(1) removed the second commit of the previous version, which was
intended to remove tap_using_vnet_hdr()
(2) the last commit has been revised: NETMAP_BDG_OFFSET becomes
NETMAP_BDG_VNET_HDR, netmap_set_offload() implemented and
netmap_has_vnet_hdr_len() rewritten.
Vincenzo Maffione (5):
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: add offloading support to netmap backend
hw/net/virtio-net.c | 16 +++++--------
hw/net/vmxnet3.c | 12 ++++------
include/net/net.h | 19 +++++++++++++++
include/net/tap.h | 4 ++--
net/net.c | 55 +++++++++++++++++++++++++++++++++++++++++++
net/netmap.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
net/tap-win32.c | 8 +++----
net/tap.c | 12 +++++++---
8 files changed, 167 insertions(+), 27 deletions(-)
--
1.8.5.2
