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make max (packet) segment size configurable

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Green Sky
2023-06-16 02:04:00 +02:00
parent 304aae05c2
commit 27aeb03a61
3 changed files with 34 additions and 23 deletions
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19
ledbat.hpp
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@ -18,19 +18,24 @@ struct LEDBAT {
static constexpr size_t UDP_HEADER_SIZE {8};
// TODO: tcp AND IPv6 will be different
static constexpr size_t segment_overhead {
static constexpr size_t SEGMENT_OVERHEAD {
4+ // ft overhead
46+ // tox?
UDP_HEADER_SIZE+
IPV4_HEADER_SIZE
};
static constexpr size_t maximum_segment_size {496 + segment_overhead}; // tox 500 - 4 from ft
static_assert(maximum_segment_size == 574); // mesured in wireshark
// TODO: make configurable, set with tox ngc lossy packet size
//const size_t MAXIMUM_SEGMENT_DATA_SIZE {1000-4};
const size_t MAXIMUM_SEGMENT_DATA_SIZE {500-4};
//static constexpr size_t maximum_segment_size {496 + segment_overhead}; // tox 500 - 4 from ft
const size_t MAXIMUM_SEGMENT_SIZE {MAXIMUM_SEGMENT_DATA_SIZE + SEGMENT_OVERHEAD}; // tox 500 - 4 from ft
//static_assert(maximum_segment_size == 574); // mesured in wireshark
// ledbat++ says 60ms, we might need other values if relayed
const float target_delay {0.060f};
//const float target_delay {0.030f};
//const float target_delay {0.060f};
const float target_delay {0.030f};
//const float target_delay {0.120f}; // 2x if relayed?
// TODO: use a factor for multiple of rtt
@ -41,7 +46,7 @@ struct LEDBAT {
float max_byterate_allowed {10*1024*1024}; // 10MiB/s
public:
LEDBAT(void);
LEDBAT(size_t maximum_segment_data_size);
// return the current believed window in bytes of how much data can be inflight,
// without overstepping the delay requirement
@ -86,7 +91,7 @@ struct LEDBAT {
private: // state
//float _cto {2.f}; // congestion timeout value in seconds
float _cwnd {2.f * maximum_segment_size}; // in bytes
float _cwnd {2.f * MAXIMUM_SEGMENT_SIZE}; // in bytes
float _base_delay {2.f}; // lowest mesured delay in _rtt_buffer in seconds
float _last_cwnd {0.f}; // timepoint of last cwnd correction