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

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

Applied to dpdk-next-virtio.

	--yliu

On Mon, May 02, 2016 at 05:46:15PM -0700, Yuanhan Liu wrote:
> 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