But if not initialize allocated mbuf->next = NULL, when do ip package assemble,
the last mbuf->next maybe not be null, all the logical has error, the
application use null pointer determine a packaged end. DPDK NIC doesn't work
now.
-Original Message-
From: Stephen Hemminger [mailto:step...@networkplumber.org]
Sent: Wednesday, December 13, 2017 1:31 PM
To: Liu, Chunmei
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] fix ceph async messenger runtime bug based on
spdk/dpdk
On Wed, 13 Dec 2017 11:32:32 -0800
chunmei Liu 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.
