diff options
Diffstat (limited to 'node/Constants.hpp')
| -rw-r--r-- | node/Constants.hpp | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/node/Constants.hpp b/node/Constants.hpp index 0d3692f1..420343ad 100644 --- a/node/Constants.hpp +++ b/node/Constants.hpp @@ -275,6 +275,19 @@ #define ZT_MULTIPATH_BINDER_REFRESH_PERIOD 5000 /** + * Packets are only used for QoS/ACK statistical sampling if their packet ID is divisible by + * this integer. This is to provide a mechanism for both peers to agree on which packets need + * special treatment without having to exchange information. Changing this value would be + * a breaking change and would necessitate a protocol version upgrade. Since each incoming and + * outgoing packet ID is checked against this value its evaluation is of the form: + * (id & (divisor - 1)) == 0, thus the divisor must be a power of 2. + * + * This value is set at (16) so that given a normally-distributed RNG output we will sample + * 1/16th (or ~6.25%) of packets. + */ +#define ZT_PATH_QOS_ACK_PROTOCOL_DIVISOR 0x10 + +/** * Time horizon for VERB_QOS_MEASUREMENT and VERB_ACK packet processing cutoff */ #define ZT_PATH_QOS_ACK_CUTOFF_TIME 30000 @@ -384,7 +397,7 @@ /** * Minimum amount of time between each ACK packet */ -#define ZT_PATH_ACK_INTERVAL 250 +#define ZT_PATH_ACK_INTERVAL 1000 /** * How often an aggregate link statistics report is emitted into this tracing system |