unom/punktfunk
5
0
Fork 0
Code Issues Pull Requests 2 Actions Packages Projects Releases 39 Wiki Activity

fix(core/clock): re-sync survives loaded links — floor baseline, spaced rounds, bounded staleness

Browse Source 
The mid-stream clock re-sync starved on high-bitrate LAN sessions (2026-07
PyroWave-sawtooth field report, RX 9070 XT -> 780M @ 550 Mb/s): every batch
was judged against the CONNECT-TIME RTT, measured before the video data
plane existed, with a 2 ms floor — mid-stream control RTTs on a loaded GbE
link sit above that almost permanently, so batches were rejected for
minutes while the wall clocks drifted apart and the OSD e2e figure ramped
19->150 ms before snapping back on a lucky batch.

Three changes:
- Rounds are spaced 7 ms apart (stamped at send time, so the spacing never
  lands in the RTT). An 8-round batch used to complete inside ONE ~6 ms
  video burst — all rounds sampled the same congestion state; spacing walks
  them across the frame cycle so the min-RTT round finds a quiet gap.
- ResyncGuard replaces the static baseline: the guard band follows the best
  RTT the session has evidenced (connect RTT, then min over every completed
  batch — rejected ones included).
- Rejection streaks are bounded: after 3 consecutive rejections the best
  (min-RTT) batch of the streak is applied anyway. Its queueing bias is at
  most ~half its RTT; unbounded wall-clock drift costs more per minute.

Rejections now log at warn with the streak and floor — the starvation
signature is grep-able in exactly the logs users send.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
enricobuehler
2026-07-27 12:51:11 +02:00
co-authored by Claude Fable 5
parent 94b7a834cb
commit 53640b8754
5 changed files with 212 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/punktfunk-core/src/client/pump.rs
+2 -2
View File
@@ -11,8 +11,8 @@ use crate::abr::BitrateController;
use crate::config::Role;
use crate::packet::FLAG_PROBE;
use crate::quic::{
accept_resync, io, wall_clock_ns, window_loss_ppm, BitrateChanged, ClipState, ClockEcho,
ClockResync, Hello, LossReport, ProbeResult, Reconfigure, Reconfigured, RequestKeyframe,
io, wall_clock_ns, window_loss_ppm, BitrateChanged, ClipState, ClockEcho, ClockResync, Hello,
LossReport, ProbeResult, Reconfigure, Reconfigured, RequestKeyframe, ResyncAdmit, ResyncGuard,
ResyncStep, SetBitrate, Start, Welcome,
};
use crate::session::Session;