[dpdk-dev] [PATCH 0/5] Fixes and enhancements for Tx path in Virtio PMD

Tiwei Bie tiwei.bie at intel.com
Tue Feb 19 11:59:46 CET 2019


Below is a quick (unofficial) performance test (macfwd loop, 64B)
for the packed ring optimizations in this series on an Intel(R)
Xeon(R) Gold 6140 CPU @ 2.30GHz platform:

w/o this series:
packed ring normal/in-order:  ~10.4 Mpps

w/ this series:
packed ring normal:           ~10.9 Mpps
packed ring in-order:         ~11.3 Mpps

In the test, we need to make sure that the vhost side is fast enough.
So 4 forwarding cores are used in vhost side, and 1 forwarding core is
used in virtio side.

vhost side:

./x86_64-native-linuxapp-gcc/app/testpmd \
        -l 13,14,15,16,17 \
        --socket-mem 1024,0 \
        --file-prefix=vhost \
        --vdev=net_vhost0,iface=/tmp/vhost0,queues=4 \
        -- \
        --forward-mode=mac \
        -i \
        --rxq=4 \
        --txq=4 \
        --nb-cores 4

virtio side:

./x86_64-native-linuxapp-gcc/app/testpmd \
        -l 8,9,10,11,12 \
        --socket-mem 1024,0 \
        --single-file-segments \
        --file-prefix=virtio-user \
        --vdev=virtio_user0,path=/tmp/vhost0,queues=4,in_order=1,packed_vq=1 \
        -- \
        --forward-mode=mac \
        -i \
        --rxq=4 \
        --txq=4 \
        --nb-cores 1


Tiwei Bie (5):
  net/virtio: fix Tx desc cleanup for packed ring
  net/virtio: fix in-order Tx path for split ring
  net/virtio: fix in-order Tx path for packed ring
  net/virtio: introduce a helper for clearing net header
  net/virtio: optimize xmit enqueue for packed ring

 drivers/net/virtio/virtio_ethdev.c |   4 +-
 drivers/net/virtio/virtio_rxtx.c   | 203 ++++++++++++++++++++---------
 2 files changed, 146 insertions(+), 61 deletions(-)

-- 
2.17.1



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