2016-05-24 21:23, Zhihong Wang: > This patch fixes rte_memcpy performance in Haswell and Broadwell for > vhost when copy size larger than 256 bytes. > > It is observed that for large copies like 1024/1518 ones, rte_memcpy > suffers high ratio of store buffer full issue which causes pipeline > to stall in scenarios like vhost enqueue. This can be alleviated by > adjusting instruction layout. Note that this issue may not be visible > in micro test. > > How to reproduce? > > PHY-VM-PHY using vhost/virtio or vhost/virtio loop back, with large > packets like 1024/1518 bytes ones. Make sure packet generation rate > is not the bottleneck if PHY-VM-PHY is used. > > Signed-off-by: Zhihong Wang <zhihong.wang at intel.com>
Test report: http://dpdk.org/ml/archives/dev/2016-May/039716.html Applied, thanks
