ebc0ffae5d
fib_lookup() converted to be called in RCU protected context, no reference taken and released on a contended cache line (fib_clntref) fib_table_lookup() and fib_semantic_match() get an additional parameter. struct fib_info gets an rcu_head field, and is freed after an rcu grace period. Stress test : (Sending 160.000.000 UDP frames on same neighbour, IP route cache disabled, dual E5540 @2.53GHz, 32bit kernel, FIB_HASH) (about same results for FIB_TRIE) Before patch : real 1m31.199s user 0m13.761s sys 23m24.780s After patch: real 1m5.375s user 0m14.997s sys 15m50.115s Before patch Profile : 13044.00 15.4% __ip_route_output_key vmlinux 8438.00 10.0% dst_destroy vmlinux 5983.00 7.1% fib_semantic_match vmlinux 5410.00 6.4% fib_rules_lookup vmlinux 4803.00 5.7% neigh_lookup vmlinux 4420.00 5.2% _raw_spin_lock vmlinux 3883.00 4.6% rt_set_nexthop vmlinux 3261.00 3.9% _raw_read_lock vmlinux 2794.00 3.3% fib_table_lookup vmlinux 2374.00 2.8% neigh_resolve_output vmlinux 2153.00 2.5% dst_alloc vmlinux 1502.00 1.8% _raw_read_lock_bh vmlinux 1484.00 1.8% kmem_cache_alloc vmlinux 1407.00 1.7% eth_header vmlinux 1406.00 1.7% ipv4_dst_destroy vmlinux 1298.00 1.5% __copy_from_user_ll vmlinux 1174.00 1.4% dev_queue_xmit vmlinux 1000.00 1.2% ip_output vmlinux After patch Profile : 13712.00 15.8% dst_destroy vmlinux 8548.00 9.9% __ip_route_output_key vmlinux 7017.00 8.1% neigh_lookup vmlinux 4554.00 5.3% fib_semantic_match vmlinux 4067.00 4.7% _raw_read_lock vmlinux 3491.00 4.0% dst_alloc vmlinux 3186.00 3.7% neigh_resolve_output vmlinux 3103.00 3.6% fib_table_lookup vmlinux 2098.00 2.4% _raw_read_lock_bh vmlinux 2081.00 2.4% kmem_cache_alloc vmlinux 2013.00 2.3% _raw_spin_lock vmlinux 1763.00 2.0% __copy_from_user_ll vmlinux 1763.00 2.0% ip_output vmlinux 1761.00 2.0% ipv4_dst_destroy vmlinux 1631.00 1.9% eth_header vmlinux 1440.00 1.7% _raw_read_unlock_bh vmlinux Reference results, if IP route cache is enabled : real 0m29.718s user 0m10.845s sys 7m37.341s 25213.00 29.5% __ip_route_output_key vmlinux 9011.00 10.5% dst_release vmlinux 4817.00 5.6% ip_push_pending_frames vmlinux 4232.00 5.0% ip_finish_output vmlinux 3940.00 4.6% udp_sendmsg vmlinux 3730.00 4.4% __copy_from_user_ll vmlinux 3716.00 4.4% ip_route_output_flow vmlinux 2451.00 2.9% __xfrm_lookup vmlinux 2221.00 2.6% ip_append_data vmlinux 1718.00 2.0% _raw_spin_lock_bh vmlinux 1655.00 1.9% __alloc_skb vmlinux 1572.00 1.8% sock_wfree vmlinux 1345.00 1.6% kfree vmlinux Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
#ifndef _FIB_LOOKUP_H
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#define _FIB_LOOKUP_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <net/ip_fib.h>
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struct fib_alias {
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struct list_head fa_list;
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struct fib_info *fa_info;
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u8 fa_tos;
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u8 fa_type;
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u8 fa_scope;
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u8 fa_state;
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#ifdef CONFIG_IP_FIB_TRIE
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struct rcu_head rcu;
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#endif
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};
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#define FA_S_ACCESSED 0x01
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/* Exported by fib_semantics.c */
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extern int fib_semantic_match(struct list_head *head,
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const struct flowi *flp,
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struct fib_result *res, int prefixlen, int fib_flags);
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extern void fib_release_info(struct fib_info *);
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extern struct fib_info *fib_create_info(struct fib_config *cfg);
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extern int fib_nh_match(struct fib_config *cfg, struct fib_info *fi);
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extern int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
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u32 tb_id, u8 type, u8 scope, __be32 dst,
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int dst_len, u8 tos, struct fib_info *fi,
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unsigned int);
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extern void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
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int dst_len, u32 tb_id, struct nl_info *info,
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unsigned int nlm_flags);
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extern struct fib_alias *fib_find_alias(struct list_head *fah,
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u8 tos, u32 prio);
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extern int fib_detect_death(struct fib_info *fi, int order,
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struct fib_info **last_resort,
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int *last_idx, int dflt);
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static inline void fib_result_assign(struct fib_result *res,
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struct fib_info *fi)
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{
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if (res->fi != NULL)
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fib_info_put(res->fi);
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res->fi = fi;
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if (fi != NULL)
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atomic_inc(&fi->fib_clntref);
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}
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#endif /* _FIB_LOOKUP_H */
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