kitetorrent-session/io.github.yuroyami.kitetorrent.session.net/UtpStream/Companion

Companion

object Companion

Properties

const val ACK_MASK: Int = 65535

ACK_MASK from utp_stream.cpp: seq/ack numbers are 16-bit wrap counters.

BASE_DELAY_BUCKET_MICROS

const val BASE_DELAY_BUCKET_MICROS: Long

Duration of one base-delay bucket (~1 minute), matching libtorrent's delay-base update.

BASE_DELAY_BUCKETS

const val BASE_DELAY_BUCKETS: Int = 13

Number of live base-delay buckets kept (the rolling window the base-min spans).

DEFAULT_MAX_PAYLOAD

const val DEFAULT_MAX_PAYLOAD: Int = 1400

Initial per-packet payload (MSS) before any PMTU shrinking (1500 - IP/UDP/uTP).

DEFAULT_MIN_TIMEOUT_MICROS

const val DEFAULT_MIN_TIMEOUT_MICROS: Long

RTO floor (min_timeout): 500 ms, matching libtorrent's min_timeout.

DEFAULT_SEND_WINDOW

const val DEFAULT_SEND_WINDOW: Int

Our advertised receive window / the cwnd ceiling (bytes).

DEFAULT_TICK_INTERVAL_MS

const val DEFAULT_TICK_INTERVAL_MS: Long = 100

Internal retransmission ticker cadence (ms).

const val DUP_ACK_LIMIT: Int = 3

Dup-ACK / SACKed-above threshold that triggers a fast retransmit (dup_ack_limit).

const val INIT_CWND: Int

Initial congestion window: two MSS, the conventional slow-start start.

MAX_BACKOFF_SHIFT

const val MAX_BACKOFF_SHIFT: Int = 5

Cap the exponential backoff shift so the timeout can't run away.

const val MAX_CWND: Int

Cap on cwnd growth (bytes). The peer's advertised wnd_size caps it further (see awaitWindow).

MAX_TIMEOUT_MICROS

const val MAX_TIMEOUT_MICROS: Long

Absolute ceiling on a single RTO interval (60 s).

const val MAX_TIMEOUTS: Int = 6

Give up (fail the socket) after this many consecutive RTO retransmits.

const val MIN_MSS: Int

Floor the discovered MSS can shrink to (mtu_floor): a safe payload for the IPv6 minimum MTU (1280) minus IPv6+UDP+uTP overhead (40+8+20). Below this we stop shrinking, since essentially every path carries at least this.

MSS_SHRINK_STEP

const val MSS_SHRINK_STEP: Int = 64

Bytes the MSS drops per shrink step when repeated loss suggests over-MTU packets.

MTU_SHRINK_AFTER

const val MTU_SHRINK_AFTER: Int = 2

Consecutive RTO rounds before the first MSS shrink (treat the first round as plain loss).

const val SACK_MAX_BITS: Int = 256

Max bits a SACK bitmask can carry (32 bytes × 8), per libtorrent.

TARGET_DELAY_MICROS

const val TARGET_DELAY_MICROS: Long

LEDBAT target queuing delay: 100 ms, the BEP-29 / libtorrent target_delay.