[dpdk-dev] [PATCH 3/3] vhost: arrange virtio_net fields for better cache sharing

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

the ifname[] field takes so much space, that it seperate some frequently
used fields into different caches, say, features and broadcast_rarp.

This patch move all those fields that will be accessed frequently in Rx/Tx
together (before the ifname[] field) to let them share one cache line.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
 lib/librte_vhost/vhost-net.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/librte_vhost/vhost-net.h b/lib/librte_vhost/vhost-net.h
index 9dec83c..3b0ffe7 100644
--- a/lib/librte_vhost/vhost-net.h
+++ b/lib/librte_vhost/vhost-net.h
@@ -123,16 +123,16 @@ struct virtio_net {
 	int			vid;
 	uint32_t		flags;
 	uint16_t		vhost_hlen;
+	/* to tell if we need broadcast rarp packet */
+	rte_atomic16_t		broadcast_rarp;
+	uint32_t		virt_qp_nb;
+	struct vhost_virtqueue	*virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
 #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
 	char			ifname[IF_NAME_SZ];
-	uint32_t		virt_qp_nb;
 	uint64_t		log_size;
 	uint64_t		log_base;
 	struct ether_addr	mac;
 
-	/* to tell if we need broadcast rarp packet */
-	rte_atomic16_t		broadcast_rarp;
-	struct vhost_virtqueue	*virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
 } __rte_cache_aligned;
 
 /**
-- 
1.9.0