[dpdk-dev] [PATCH 0/3] [RFC] vhost: micro vhost optimization

[Yuanhan Liu]

Here is a small patch set does the micro optimization, which brings about
10% performance boost in my 64B packet testing, with the following topo:

    pkt generator <----> NIC <-----> Virtio NIC

Patch 1 pre updates the used ring and update them in batch. It should be
feasible from my understanding: there will be no issue, guest driver will
not start processing them as far as we haven't updated the "used->idx"
yet. I could miss something though.

Patch 2 saves one check for small packets (that can be hold in one desc
buf and mbuf).

Patch 3 moves several frequently used fields into one cache line, for
better cache sharing. 

Note that this patch set is based on my latest vhost ABI refactoring patchset.


---
Yuanhan Liu (3):
  vhost: pre update used ring for Tx and Rx
  vhost: optimize dequeue for small packets
  vhost: arrange virtio_net fields for better cache sharing

 lib/librte_vhost/vhost-net.h  |   8 +--
 lib/librte_vhost/vhost_rxtx.c | 110 ++++++++++++++++++++++++------------------
 2 files changed, 68 insertions(+), 50 deletions(-)

-- 
1.9.0