rxrpc: Reduce the number of PING ACKs sent
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>
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index c121949..cbb5d53 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -44,9 +44,12 @@
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);
}
/*
