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
