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Re: [Qemu-devel] [ RFC Patch v5 0/2] Support Receive-Segment-Offload(RSC
Michael S. Tsirkin
Re: [Qemu-devel] [ RFC Patch v5 0/2] Support Receive-Segment-Offload(RSC) for WHQL
Tue, 24 May 2016 11:26:10 +0300
On Tue, May 24, 2016 at 04:03:04PM +0800, Jason Wang wrote:
> On 2016年05月24日 04:14, address@hidden wrote:
> >From: Wei Xu <address@hidden>
> >Changes in V5:
> >- Passed all IPv4/6 test cases
> >- Add new fields in 'virtio_net_hdr'
> >- Set 'gso_type' & 'coalesced packets' in new field.
> >- Bypass all 'tcp option' packet
> >- Bypass all 'pure ack' packet
> >- Bypass all 'duplicate ack' packet
> >- Change 'guest_rsc' feature bit to 'false' by default
> >- Feedbacks from v4, typo, etc.
> Patch does not apply on master ...
> >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.
> Can we split the patches into smaller ones to make review or merging easier?
> E.g can we send the patches without any feature negotiation and vnet header
> We can focus on the coalescing (maybe ipv4) without any guest involvement in
> this series. In this way, the issues were limited and can be converged soon.
> After this has been merged, we can add patches that co-operate with guests
> on top (since it needs agreement on virtio specs). Does this sounds a good
True but disabling everything when feature is not negotiated
reduces the risk somewhat.
> >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
> >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
> >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
> >as i moved on.
> >1. With a tcp socket client/server pair running on 2 linux guest, thus i can
> >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 (2):
> > virtio-net rsc: support coalescing ipv4 tcp traffic
> > virtio-net rsc: support coalescing ipv6 tcp traffic
> > hw/net/virtio-net.c | 623
> > +++++++++++++++++++++++++++-
> > include/hw/virtio/virtio-net.h | 2 +
> > include/hw/virtio/virtio.h | 75 ++++
> > include/standard-headers/linux/virtio_net.h | 2 +
> > 4 files changed, 699 insertions(+), 3 deletions(-)