From: Wei Xu <w...@redhat.com> Changes in V4: - Add new host feature bit - Replace using fixed header lenght with dynamic header lenght in VirtIONet - Change ip/ip6 header union in NetRscUnit to void* pointer - Add macro prefix, adjust code indent, etc.
Changes in V3: - Removed big param list, replace it with 'NetRscUnit' - Different virtio header size - Modify callback function to direct call. - Needn't check the failure of g_malloc() - Other code format adjustment, macro naming, etc Changes in V2: - Add detailed commit log This patch is to support WHQL test for Windows guest, while this feature also benifits other guest works as a kernel 'gro' like feature with userspace implementation. Feature information: http://msdn.microsoft.com/en-us/library/windows/hardware/jj853324 Both IPv4 and IPv6 are supported, though performance with userspace virtio is slow than vhost-net, there is about 1.5x to 2x performance improvement to userspace virtio, this is done by turning this feature on and disable 'tso/gso/gro' on corresponding tap interface and guest interface, while get less improment with all these feature on. Linux guest performance data(Netperf): MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.2.101 () port 0 AF_INET : nodelay Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 64 6.00 1221.20 87380 16384 64 6.00 1260.30 87380 16384 128 6.00 1978.51 87380 16384 128 6.00 2286.05 87380 16384 256 6.00 2677.94 87380 16384 256 6.00 4615.42 87380 16384 512 6.00 2956.54 87380 16384 512 6.00 5356.39 87380 16384 1024 6.00 2798.17 87380 16384 1024 6.00 4943.30 87380 16384 2048 6.00 2681.09 87380 16384 2048 6.00 4835.81 87380 16384 4096 6.00 3390.14 87380 16384 4096 6.00 5391.54 87380 16384 8092 6.00 3008.27 87380 16384 8092 6.00 5381.68 87380 16384 10240 6.00 2999.89 87380 16384 10240 6.00 5393.11 Test steps: Although this feature is mainly used for window guest, i used linux guest to help test the feature, to make things simple, i used 3 steps to test the patch as i moved on. 1. With a tcp socket client/server pair running on 2 linux guest, thus i can control the traffic and debugging the code as i want. 2. Netperf on linux guest test the throughput. 3. WHQL test with 2 Windows guests. Current status: IPv4 pass all the above tests. IPv6 just passed test step 1 and 2 as described ahead, the virtio nic cannot receive any packet in WHQL test, trying with a win debug binary Note: A 'MessageDevice' nic chose as 'Realtek' will panic the system sometimes during setup, this can be figured out by replacing it with an 'e1000' nic. Todo: More sanity check and tcp 'ecn' and 'window' scale test. Wei Xu (3): virtio-net rsc: add a new host offload(rsc) feature bit virtio-net rsc: support coalescing ipv4 tcp traffic virtio-net rsc: support coalescing ipv6 tcp traffic hw/net/virtio-net.c | 642 +++++++++++++++++++++++++++- include/hw/virtio/virtio-net.h | 1 + include/hw/virtio/virtio.h | 72 ++++ include/standard-headers/linux/virtio_net.h | 1 + 4 files changed, 714 insertions(+), 2 deletions(-) -- 2.5.0
