The absolute download backstop was a flat _MAX_XFER_POLLS=1200 (~60min). A large
album (e.g. Drake "Scorpion", 521MB / 25 FLACs) from a slow-but-healthy serial
peer (~400KB/s, serving one file at a time) needs ~60-70min, so it was cut off
at 60min and — because an abandoned transfer is cancelled and re-enqueued from
scratch — re-downloaded from zero every attempt, never finishing and eventually
going needs_attention at the attempt cap.
Replace the flat cap with _max_polls(total_bytes): budget the backstop at a
conservative floor throughput (~64KB/s), clamped to [20min, 2h]. Scorpion now
gets the full 2h ceiling instead of 60min. The 90s stall timeout is unchanged,
so a truly dead/queued peer is still abandoned fast.
Follow-up (not in this change): resume across retries (skip files slskd already
completed) so an abandoned large download doesn't restart from zero.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jonathan
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