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rxrpc: Reduce the number of PING ACKs sent

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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>
This commit is contained in:
David Howells 2016-09-22 00:29:32 +01:00
parent 0d4b103c00
commit fc943f6777
2 changed files with 6 additions and 3 deletions
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3
net/rxrpc/input.c
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@ -44,7 +44,10 @@ 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;
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);
}