Commit 9823f39a authored Feb 07, 2014 by David Howells

af_rxrpc: Improve ACK production



Improve ACK production by the following means:

 (1) Don't send an ACK_REQUESTED ack immediately even if the RXRPC_MORE_PACKETS
     flag isn't set on a data packet that has also has RXRPC_REQUEST_ACK set.

     MORE_PACKETS just means that the sender just emptied its Tx data buffer.
     More data will be forthcoming unless RXRPC_LAST_PACKET is also flagged.

     It is possible to see runs of DATA packets with MORE_PACKETS unset that
     aren't waiting for an ACK.

     It is therefore better to wait a small instant to see if we can combine an
     ACK for several packets.

 (2) Don't send an ACK_IDLE ack immediately unless we're responding to the
     terminal data packet of a call.

     Whilst sending an ACK_IDLE mid-call serves to let the other side know
     that we won't be asking it to resend certain Tx buffers and that it can
     discard them, spamming it with loads of acks just because we've
     temporarily run out of data just distracts it.

 (3) Put the ACK_IDLE ack generation timeout up to half a second rather than a
     single jiffy.  Just because we haven't been given more data immediately
     doesn't mean that more isn't forthcoming.  The other side may be busily
     finding the data to send to us.

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

parent 5873c083

net/rxrpc/ar-ack.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -41,7 +41,7 @@ unsigned rxrpc_soft_ack_delay = 1 * HZ;
		* further packets aren't immediately received to decide when to send an IDLE
		* ACK let the other end know that it can free up its Tx buffer space.
		*/
		unsigned rxrpc_idle_ack_delay = 1;
		unsigned rxrpc_idle_ack_delay = 0.5 * HZ;

		static const char *rxrpc_acks(u8 reason)
		{

net/rxrpc/ar-input.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -347,8 +347,7 @@ void rxrpc_fast_process_packet(struct rxrpc_call call, struct sk_buff skb)
		* it */
		if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
		_proto("ACK Requested on %%%u", serial);
		rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial,
		!(sp->hdr.flags & RXRPC_MORE_PACKETS));
		rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false);
		}

		switch (sp->hdr.type) {

net/rxrpc/ar-skbuff.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -90,7 +90,7 @@ static void rxrpc_hard_ACK_data(struct rxrpc_call *call,
		*/
		_debug("send Rx idle ACK");
		__rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, sp->hdr.serial,
		true);
		false);
		}

		spin_unlock_bh(&call->lock);

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