Cloudflare Blog company blog
When “idle” isn't idle: how a Linux kernel optimization became a QUIC bug
We investigated a bug where CUBIC's congestion window became pinned at its minimum floor, causing a performance to plummet. The fix involved correctly measuring idle periods to distinguish RTT wait times from actual application idleness.
- Points
- 163
- HN comments
- 37
- Submissions
- 1
- Cited by
- 0 commenters
Systems & PerformanceNetworking & Internet2026
On Hacker News
| Submitted | Title on HN | Points | Comments |
|---|---|---|---|
| May 12, 2026 | When “idle” isn't idle: how a Linux kernel optimization became a QUIC bug by sbulaev | 163 | 37 |
