[dpdk-dev] [PATCH v2] vhost: adaptively batch small guest memory copies

[santosh]

On Friday 08 September 2017 06:20 PM, Tiwei Bie wrote:
> This patch adaptively batches the small guest memory copies.
> By batching the small copies, the efficiency of executing the
> memory LOAD instructions can be improved greatly, because the
> memory LOAD latency can be effectively hidden by the pipeline.
> We saw great performance boosts for small packets PVP test.
>
> This patch improves the performance for small packets, and has
> distinguished the packets by size. So although the performance
> for big packets doesn't change, it makes it relatively easy to
> do some special optimizations for the big packets too.
>
> Signed-off-by: Tiwei Bie <tiwei.bie at intel.com>
> Signed-off-by: Zhihong Wang <zhihong.wang at intel.com>
> Signed-off-by: Zhiyong Yang <zhiyong.yang at intel.com>
> Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> ---
> This optimization depends on the CPU internal pipeline design.
> So further tests (e.g. ARM) from the community is appreciated.
>
> v2: s/burst_copy/batch_copy/g

In pvp setup for arm64 platform, no performance drop noticed with this patch but no significant performance gain either. Tested-by: Santosh Shukla <santosh.shukla at caviumnetworks.com>