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dpif-netdev: Reorder elements in dp_netdev_port structure.

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By reordering the elements in dp_netdev_port structure, pad bytes can be
reduced there by saving a cache line. Marginal performance improvement
is also observed with this change.

Before: structure size: 136, holes: 7, sum padbytes:7, cachelines:3
After : structure size: 128, holes: 6, sum padbytes:0, cachelines:2

Signed-off-by: Bhanuprakash Bodireddy <bhanuprakash.bodireddy@intel.com>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Tested-by: Greg Rose <gvrose8192@gmail.com>
Signed-off-by: Darrell Ball <dlu998@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Bhanuprakash Bodireddy
2017-08-01 20:13:38 -07:00
committed by Ben Pfaff
parent ded30c74b1
commit ca62bb16ab
1 changed files with 2 additions and 2 deletions
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4
lib/dpif-netdev.c
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@@ -355,17 +355,17 @@ struct dp_netdev_rxq {
/* A port in a netdev-based datapath. */
struct dp_netdev_port {
odp_port_t port_no;
bool dynamic_txqs; /* If true XPS will be used. */
bool need_reconfigure; /* True if we should reconfigure netdev. */
struct netdev *netdev;
struct hmap_node node; /* Node in dp_netdev's 'ports'. */
struct netdev_saved_flags *sf;
struct dp_netdev_rxq *rxqs;
unsigned n_rxq; /* Number of elements in 'rxqs' */
bool dynamic_txqs; /* If true XPS will be used. */
unsigned *txq_used; /* Number of threads that use each tx queue. */
struct ovs_mutex txq_used_mutex;
char *type; /* Port type as requested by user. */
char *rxq_affinity_list; /* Requested affinity of rx queues. */
bool need_reconfigure; /* True if we should reconfigure netdev. */
};
/* Contained by struct dp_netdev_flow's 'stats' member. */