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SubjectRe: [rfc net-next v6 0/3] Multiqueue virtio-net
On 10/30/2012 03:03 AM, Jason Wang wrote:
> Hi all:
>
> This series is an update version of multiqueue virtio-net driver based on
> Krishna Kumar's work to let virtio-net use multiple rx/tx queues to do the
> packets reception and transmission. Please review and comments.
>
> Changes from v5:
> - Align the implementation with the RFC spec update v4
> - Switch the mode between single mode and multiqueue mode without reset
> - Remove the 256 limitation of queues
> - Use helpers to do the mapping between virtqueues and tx/rx queues
> - Use commbined channels instead of separated rx/tx queus when do the queue
> number configuartion
> - Other coding style comments from Michael
>
> Reference:
> - A protype implementation of qemu-kvm support could by found in
> git://github.com/jasowang/qemu-kvm-mq.git
> - V5 could be found at http://lwn.net/Articles/505388/
> - V4 could be found at https://lkml.org/lkml/2012/6/25/120
> - V2 could be found at http://lwn.net/Articles/467283/
> - Michael virtio-spec: http://www.spinics.net/lists/netdev/msg209986.html
>
> Perf Numbers:
>
> - Pktgen test shows the receiving capability of the multiqueue virtio-net were
> dramatically improved.
> - Netperf result shows latency were greately improved according to the test
> result.

I suppose it is technically correct to say that latency was improved,
but usually for aggregate request/response tests I tend to talk about
the aggregate transactions per second.

Do you have a hypothesis as to why the improvement dropped going to 20
concurrent sessions from 10?

rick jones

> Netperf Local VM to VM test:
> - VM1 and its vcpu/vhost thread in numa node 0
> - VM2 and its vcpu/vhost thread in numa node 1
> - a script is used to lauch the netperf with demo mode and do the postprocessing
> to measure the aggreagte result with the help of timestamp
> - average of 3 runs
>
> TCP_RR:
> size/session/+lat%/+normalize%
> 1/ 1/ 0%/ 0%
> 1/ 10/ +52%/ +6%
> 1/ 20/ +27%/ +5%
> 64/ 1/ 0%/ 0%
> 64/ 10/ +45%/ +4%
> 64/ 20/ +28%/ +7%
> 256/ 1/ -1%/ 0%
> 256/ 10/ +38%/ +2%
> 256/ 20/ +27%/ +6%
> TCP_CRR:
> size/session/+lat%/+normalize%
> 1/ 1/ -7%/ -12%
> 1/ 10/ +34%/ +3%
> 1/ 20/ +3%/ -8%
> 64/ 1/ -7%/ -3%
> 64/ 10/ +32%/ +1%
> 64/ 20/ +4%/ -7%
> 256/ 1/ -6%/ -18%
> 256/ 10/ +33%/ 0%
> 256/ 20/ +4%/ -8%
> STREAM:
> size/session/+thu%/+normalize%
> 1/ 1/ -3%/ 0%
> 1/ 2/ -1%/ 0%
> 1/ 4/ -2%/ 0%
> 64/ 1/ 0%/ +1%
> 64/ 2/ -6%/ -6%
> 64/ 4/ -8%/ -14%
> 256/ 1/ 0%/ 0%
> 256/ 2/ -48%/ -52%
> 256/ 4/ -50%/ -55%
> 512/ 1/ +4%/ +5%
> 512/ 2/ -29%/ -33%
> 512/ 4/ -37%/ -49%
> 1024/ 1/ +6%/ +7%
> 1024/ 2/ -46%/ -51%
> 1024/ 4/ -15%/ -17%
> 4096/ 1/ +1%/ +1%
> 4096/ 2/ +16%/ -2%
> 4096/ 4/ +31%/ -10%
> 16384/ 1/ 0%/ 0%
> 16384/ 2/ +16%/ +9%
> 16384/ 4/ +17%/ -9%
>
> Netperf test between external host and guest over 10gb(ixgbe):
> - VM thread and vhost threads were pinned int the node 0
> - a script is used to lauch the netperf with demo mode and do the postprocessing
> to measure the aggreagte result with the help of timestamp
> - average of 3 runs
>
> TCP_RR:
> size/session/+lat%/+normalize%
> 1/ 1/ 0%/ +6%
> 1/ 10/ +41%/ +2%
> 1/ 20/ +10%/ -3%
> 64/ 1/ 0%/ -10%
> 64/ 10/ +39%/ +1%
> 64/ 20/ +22%/ +2%
> 256/ 1/ 0%/ +2%
> 256/ 10/ +26%/ -17%
> 256/ 20/ +24%/ +10%
> TCP_CRR:
> size/session/+lat%/+normalize%
> 1/ 1/ -3%/ -3%
> 1/ 10/ +34%/ -3%
> 1/ 20/ 0%/ -15%
> 64/ 1/ -3%/ -3%
> 64/ 10/ +34%/ -3%
> 64/ 20/ -1%/ -16%
> 256/ 1/ -1%/ -3%
> 256/ 10/ +38%/ -2%
> 256/ 20/ -2%/ -17%
> TCP_STREAM:(guest receiving)
> size/session/+thu%/+normalize%
> 1/ 1/ +1%/ +14%
> 1/ 2/ 0%/ +4%
> 1/ 4/ -2%/ -24%
> 64/ 1/ -6%/ +1%
> 64/ 2/ +1%/ +1%
> 64/ 4/ -1%/ -11%
> 256/ 1/ +3%/ +4%
> 256/ 2/ 0%/ -1%
> 256/ 4/ 0%/ -15%
> 512/ 1/ +4%/ 0%
> 512/ 2/ -10%/ -12%
> 512/ 4/ 0%/ -11%
> 1024/ 1/ -5%/ 0%
> 1024/ 2/ -11%/ -16%
> 1024/ 4/ +3%/ -11%
> 4096/ 1/ +27%/ +6%
> 4096/ 2/ 0%/ -12%
> 4096/ 4/ 0%/ -20%
> 16384/ 1/ 0%/ -2%
> 16384/ 2/ 0%/ -9%
> 16384/ 4/ +10%/ -2%
> TCP_MAERTS:(guest sending)
> 1/ 1/ -1%/ 0%
> 1/ 2/ 0%/ 0%
> 1/ 4/ -5%/ 0%
> 64/ 1/ 0%/ 0%
> 64/ 2/ -7%/ -8%
> 64/ 4/ -7%/ -8%
> 256/ 1/ 0%/ 0%
> 256/ 2/ -28%/ -28%
> 256/ 4/ -28%/ -29%
> 512/ 1/ 0%/ 0%
> 512/ 2/ -15%/ -13%
> 512/ 4/ -53%/ -59%
> 1024/ 1/ +4%/ +13%
> 1024/ 2/ -7%/ -18%
> 1024/ 4/ +1%/ -18%
> 4096/ 1/ +2%/ 0%
> 4096/ 2/ +3%/ -19%
> 4096/ 4/ -1%/ -19%
> 16384/ 1/ -3%/ -1%
> 16384/ 2/ 0%/ -12%
> 16384/ 4/ 0%/ -10%
>
> Jason Wang (2):
> virtio_net: multiqueue support
> virtio-net: change the number of queues through ethtool
>
> Krishna Kumar (1):
> virtio_net: Introduce VIRTIO_NET_F_MULTIQUEUE
>
> drivers/net/virtio_net.c | 790 ++++++++++++++++++++++++++++-----------
> include/uapi/linux/virtio_net.h | 19 +
> 2 files changed, 594 insertions(+), 215 deletions(-)
>
> --
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