Note:
There is still a few pending issues about the feature bit, and need to be
discussed with windows driver maintainer, so linux guests with this patch
won't work at current, haven't figure it out yet, but i'm guessing it's
caused by the 'gso_type' is set to 'VIRTIO_NET_HDR_GSO_TCPV4/6',
will fix it after get the final solution, the below test steps and
performance data is based on v4.
Another suggestion from Jason is to adjust part of the code to make it
more readable, since there maybe still few change about the flowchart
in the future, such as timestamp, duplicate ack, so i'd like to delay it
temporarily.
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.
Wei Xu (3):
virtio-net rsc: support coalescing ipv4 tcp traffic
virtio-net rsc: support coalescing ipv6 tcp traffic
virtio-net rsc: add 2 new rsc information fields to 'virtio_net_hdr'
hw/net/virtio-net.c | 642
+++++++++++++++++++++++++++-
include/hw/virtio/virtio-net.h | 2 +
include/hw/virtio/virtio.h | 75 ++++
include/standard-headers/linux/virtio_net.h | 3 +
4 files changed, 721 insertions(+), 1 deletion(-)