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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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2
net/rxrpc/call_event.c
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@ -142,7 +142,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
struct rxrpc_skb_priv *sp;
struct sk_buff *skb;
rxrpc_seq_t cursor, seq, top;
ktime_t now = ktime_get_real(), max_age, oldest, resend_at;
ktime_t now = ktime_get_real(), max_age, oldest, resend_at;
int ix;
u8 annotation, anno_type;

7
net/rxrpc/input.c
View File

@ -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);
}
/*