On 02/01/2016 02:13 AM, w...@redhat.com wrote: > From: Wei Xu <w...@redhat.com> > > Patch 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 30-40 percent performance > improvement to userspace virtio, this is done by turning this feature on > and disable 'tso' on corresponding tap interface.
Maybe you can share us with the numbers? > > 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 runnig 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 guest. > > 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, debugging on the host side shows all the packets > have been > pushed to th vring, by replacing it with a linux guest, i add 10 extra > packets before > sending out the real packet, tcpdump running on guest only capture 6 packets, > don't > find out the root cause yet, will continue working on this. Maybe you can try dropmonitor [1] in both host and guest to find the reason of packet dropping. [1] ./perf script net_dropmonitor > > 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. > > Pending issues & Todo list: > 1. Dup ack count not added in the virtio_net_hdr, but WHQL test case passes, > looks like a bug in test case. > 2. Missing a Feature Bit > 3. Missing a few tcp/ip handling > ECN change. > TCP window scale. > > Wei Xu (10): > virtio-net rsc: Data structure, 'Segment', 'Chain' and 'Status' > virtio-net rsc: Initilize & Cleanup > virtio-net rsc: Chain Lookup, Packet Caching and Framework of IPv4 > virtio-net rsc: Detailed IPv4 and General TCP data coalescing > virtio-net rsc: Create timer to drain the packets from the cache pool > virtio-net rsc: IPv4 checksum > virtio-net rsc: Checking TCP flag and drain specific connection > packets > virtio-net rsc: Sanity check & More bypass cases check > virtio-net rsc: Add IPv6 support > virtio-net rsc: Add Receive Segment Coalesce statistics > > hw/net/virtio-net.c | 626 > ++++++++++++++++++++++++++++++++++++++++- > include/hw/virtio/virtio-net.h | 1 + > include/hw/virtio/virtio.h | 65 +++++ > 3 files changed, 691 insertions(+), 1 deletion(-) >