Feature request: show average jitter in TUI

[vanderoest]

Hi, It would be nice if the TUI could show the average jitter of the total session and per time interval. I know it is logged in the log file, but including it in the TUI would also be nice.

[lance0]

The TUI stats panel already shows aggregate jitter during UDP tests (right side: "Jitter: X.XX ms" with color coding). But you're right that per-interval jitter isn't surfaced in the TUI stream bars or the plain text interval lines — I'll add that. The data is already tracked internally so it's a display change.

Plan:

• TUI per-stream bars: show jitter: X.XXms instead of rtx: 0 when protocol is UDP
• Plain text intervals: append jitter: X.XXms for UDP (already in JSON/CSV output)

Should have this in today.

[lance0]

Per-interval jitter is now displayed in v0.9.6:

• TUI stream bars: [0] ████ 1.2 Gbps jitter: 0.42ms for UDP streams (press d to toggle to Streams view with -P multi-stream)
• Plain text intervals: [1.001] 1.2 Gbps 150 MB jitter: 0.42ms lost: 0 for UDP
• TUI stats panel: aggregate jitter was already there (right side, color-coded)

cargo install xfr or grab from releases.

[vanderoest]

I have -I 10 but the jitter both per stream and aggregate update every second still?

[lance0]

The TUI refreshes every second regardless of -i — that setting only controls plain text/JSON/CSV output intervals.

Are you looking for jitter averaged over longer windows (e.g., 10-second rolling average) rather than the per-second snapshots? That would give smoother readings and might be more useful for your use case. Happy to add that if so — let me know what would be most helpful for you.

[lance0]

Just following up on my note above: I suspect the useful next step here is to keep the TUI updating every second, but smooth the jitter display over a longer rolling window so it behaves more like the view you expected.

If that sounds right, I can add that next.