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- Rev 37445 2026-08-27 18:47:45
- Author: amit
- Log message:
- Oppo/Realme: cap captcha retries per tick at 7 and 12, measured per brand
Most captcha work goes to imeis that never succeed. Measured over the last
window: oppo 6,245 attempts for 308 successes, realme 13,842 for 399. The bulk
is imeis grinding all 20 attempts in one already-refused session and getting
nothing -- oppo 279 of them, realme 610.
The imei is NOT abandoned. A captcha failure is a technical failure, not an
answer, so it stays pending and the next tick retries it in ~5 minutes with a
fresh page and session -- which the data suggests beats continuing in a session
the widget has refused seven times. This caps grinding, not retrying.
Per-brand caps, because the distributions genuinely differ:
OPPO cap 7 97.7% of successes kept, 58.4% of work saved (3,648 attempts)
Pre-glide, 33% of oppo's successes came from attempts 8-20 and 20 was the
right number. Post-glide (r37440) that is 2%: the drag lands first or second
try. cap 5 keeps 95.5%/saves 67.7%, cap 10 keeps 99.0%/saves 44.8%.
REALME cap 12 96.0% kept, 35.7% saved (4,937 attempts)
NOT 7. Realme has no glide, so its successes still spread to attempt 10+ and
a cap of 7 would cost it 16.5%. It also burns more than twice oppo's work, so
the gentler cap still saves more in absolute terms.
Combined: 8,585 of 20,087 attempts saved, ~43% less browser work, for ~3% fewer
successes per tick -- and those imeis come back next tick anyway. Less Chrome
work matters on this box: it co-hosts a 9.4GB tomcat, has 3.5GB free and has been
OOM-killed twice this month.
The two caps are independent constants and must not be synced. If glide is ported
to realme, expect its curve to shift left as oppo's did and its cap can drop to
~7 -- but measure it, do not assume it.
Windows are ~2h (oppo's only ~30 min post-glide), so the right numbers may drift.
Worth re-reading the attempt histogram after a full day.