net: shrink struct softnet_data
flow_limit in struct softnet_data is only read from local cpu and can be moved to fill a hole, reducing softnet_data size by 64 bytes on x86_64 While we are at it, move output_queue, output_queue_tailp and completion_queue, so that rx / tx paths touch a single cache line. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2329,10 +2329,7 @@ extern int netdev_flow_limit_table_len;
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* Incoming packets are placed on per-cpu queues
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*/
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struct softnet_data {
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struct Qdisc *output_queue;
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struct Qdisc **output_queue_tailp;
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struct list_head poll_list;
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struct sk_buff *completion_queue;
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struct sk_buff_head process_queue;
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/* stats */
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@ -2340,10 +2337,17 @@ struct softnet_data {
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unsigned int time_squeeze;
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unsigned int cpu_collision;
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unsigned int received_rps;
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#ifdef CONFIG_RPS
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struct softnet_data *rps_ipi_list;
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#endif
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#ifdef CONFIG_NET_FLOW_LIMIT
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struct sd_flow_limit __rcu *flow_limit;
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#endif
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struct Qdisc *output_queue;
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struct Qdisc **output_queue_tailp;
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struct sk_buff *completion_queue;
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#ifdef CONFIG_RPS
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/* Elements below can be accessed between CPUs for RPS */
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struct call_single_data csd ____cacheline_aligned_in_smp;
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struct softnet_data *rps_ipi_next;
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@ -2355,9 +2359,6 @@ struct softnet_data {
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struct sk_buff_head input_pkt_queue;
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struct napi_struct backlog;
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#ifdef CONFIG_NET_FLOW_LIMIT
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struct sd_flow_limit __rcu *flow_limit;
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#endif
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};
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static inline void input_queue_head_incr(struct softnet_data *sd)
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