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[net-next,8/9] rxrpc: Reduce the number of PING ACKs sent

Message ID 147450480416.14691.2181748630440433933.stgit@warthog.procyon.org.uk
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

David Howells Sept. 22, 2016, 12:40 a.m. UTC
We don't want to send a PING ACK for every new incoming call as that just
adds to the network traffic.  Instead, we send a PING ACK to the first
three that we receive and then once per second thereafter.

This could probably be made adjustable in future.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/input.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Comments

kernel test robot Sept. 22, 2016, 1:25 a.m. UTC | #1
Hi David,

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/David-Howells/rxrpc-Preparation-for-slow-start-algorithm/20160922-085242
config: i386-randconfig-x009-201638 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the linux-review/David-Howells/rxrpc-Preparation-for-slow-start-algorithm/20160922-085242 HEAD f739ad653a9471b67eb8fc01185c01c2ca1dcb4b builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   net/rxrpc/input.c: In function 'rxrpc_send_ping':
>> net/rxrpc/input.c:50:42: error: 'struct rxrpc_peer' has no member named 'rtt_last_req'; did you mean 'rtt_cache'?
         ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
                                             ^~

vim +50 net/rxrpc/input.c

    44				    int skew)
    45	{
    46		struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
    47		ktime_t now = skb->tstamp;
    48	
    49		if (call->peer->rtt_usage < 3 ||
  > 50		    ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
    51			rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial,
    52					  true, true);
    53	}

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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Patch

diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index c121949de3c8..cbb5d53f09d7 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -44,9 +44,12 @@  static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb,
 			    int skew)
 {
 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	ktime_t now = skb->tstamp;
 
-	rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial,
-			  true, true);
+	if (call->peer->rtt_usage < 3 ||
+	    ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
+		rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial,
+				  true, true);
 }
 
 /*