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When "idle" isn't idle: how a Linux kernel optimization became a QUIC bug — Blankdot

blog.cloudflare.com2 months ago

When "idle" isn't idle: how a Linux kernel optimization became a QUIC bug

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.

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