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Added VERB_ACK and VERB_QOS_MEASUREMENT, refined notion of path quality

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This commit is contained in:
Joseph Henry 2018-05-30 17:45:29 -07:00
parent 8199dbd0dc
commit 46a7a2be2e
18 changed files with 954 additions and 720 deletions
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52
node/Packet.hpp
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@ -419,7 +419,7 @@ public:
template<unsigned int C2>
Fragment(const Buffer<C2> &b) :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(b)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(b)
{
}
@ -930,7 +930,53 @@ public:
*/
VERB_PUSH_DIRECT_PATHS = 0x10,
// 0x11, 0x12 -- deprecated
// 0x11 -- deprecated
/**
* An acknowledgement of receipt of a series of recent packets from another
* peer. This is used to calculate relative throughput values and to detect
* packet loss. Only VERB_FRAME and VERB_EXT_FRAME packets are counted.
*
* ACK response format:
* <[4] 32-bit number of bytes received since last ACK>
*
* Upon receipt of this packet, the local peer will verify that the correct
* number of bytes were received by the remote peer. If these values do
* not agree that could be an indicator of packet loss.
*
* Additionally, the local peer knows the interval of time that has
* elapsed since the last received ACK. With this information it can compute
* a rough estimate of the current throughput.
*
* This is sent at a maximum rate of once per every ZT_PATH_ACK_INTERVAL
*/
VERB_ACK = 0x12,
/**
* A packet containing timing measurements useful for estimating path quality.
* Composed of a list of <packet ID:internal sojourn time> pairs for an
* arbitrary set of recent packets. This is used to sample for latency and
* packet delay variance (PDV, "jitter").
*
* QoS record format:
*
* <[8] 64-bit packet ID of previously-received packet>
* <[1] 8-bit packet sojourn time>
* <...repeat until end of max 1400 byte packet...>
*
* The number of possible records per QoS packet is: (1400 * 8) / 72 = 155
* This packet should be sent very rarely (every few seconds) as it can be
* somewhat large if the connection is saturated. Future versions might use
* a bloom table to probablistically determine these values in a vastly
* more space-efficient manner.
*
* Note: The 'internal packet sojourn time' is a slight misnomer as it is a
* measure of the amount of time between when a packet was received and the
* egress time of its tracking QoS packet.
*
* This is sent at a maximum rate of once per every ZT_PATH_QOS_INTERVAL
*/
VERB_QOS_MEASUREMENT = 0x13,
/**
* A message with arbitrary user-definable content:
@ -999,7 +1045,7 @@ public:
template<unsigned int C2>
Packet(const Buffer<C2> &b) :
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(b)
Buffer<ZT_PROTO_MAX_PACKET_LENGTH>(b)
{
}