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| author | Eric Dumazet <edumazet@google.com> | 2016-11-16 09:10:42 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-18 10:44:31 -0500 |
| commit | e68b6e50fa359cc5aad4d2f8ac2bdbc1a8f4fd59 (patch) | |
| tree | 7a0dbf2b9d469d6ea24f7aef3e53f03c18d62158 /net/ipv4/udp.c | |
| parent | fcd2b0da730fab9b125296e859716c9652614721 (diff) | |
| download | linux-e68b6e50fa359cc5aad4d2f8ac2bdbc1a8f4fd59.tar.gz | |
udp: enable busy polling for all sockets
UDP busy polling is restricted to connected UDP sockets. This is because sk_busy_loop() only takes care of one NAPI context. There are cases where it could be extended. 1) Some hosts receive traffic on a single NIC, with one RX queue. 2) Some applications use SO_REUSEPORT and associated BPF filter to split the incoming traffic on one UDP socket per RX queue/thread/cpu 3) Some UDP sockets are used to send/receive traffic for one flow, but they do not bother with connect() This patch records the napi_id of first received skb, giving more reach to busy polling. Tested: lpaa23:~# echo 70 >/proc/sys/net/core/busy_read lpaa24:~# echo 70 >/proc/sys/net/core/busy_read lpaa23:~# for f in `seq 1 10`; do ./super_netperf 1 -H lpaa24 -t UDP_RR -l 5; done Before patch : 27867 28870 37324 41060 41215 36764 36838 44455 41282 43843 After patch : 73920 73213 70147 74845 71697 68315 68028 75219 70082 73707 Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 9ae7c63a8b13..e1fc0116e8d5 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1569,6 +1569,8 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) sock_rps_save_rxhash(sk, skb); sk_mark_napi_id(sk, skb); sk_incoming_cpu_update(sk); + } else { + sk_mark_napi_id_once(sk, skb); } rc = __udp_enqueue_schedule_skb(sk, skb); |