[dpdk-dev] [PATCH] fix ceph async messenger runtime bug based on spdk/dpdk

Stephen Hemminger stephen at networkplumber.org
Wed Dec 13 22:31:00 CET 2017


On Wed, 13 Dec 2017 11:32:32 -0800
chunmei Liu <chunmei.liu at intel.com> wrote:

> diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
> index 1e07895..30fdbc1 100644
> --- a/drivers/net/ixgbe/ixgbe_rxtx.c
> +++ b/drivers/net/ixgbe/ixgbe_rxtx.c
> @@ -1589,6 +1589,7 @@ ixgbe_rx_alloc_bufs(struct ixgbe_rx_queue *rxq, bool reset_mbuf)
>  		}
>  
>  		rte_mbuf_refcnt_set(mb, 1);
> +		mb->next = NULL;
>  		mb->data_off = RTE_PKTMBUF_HEADROOM;
>  

This will have measurable performance impact because the next pointer is
on the second cache line.


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