https://ai-blog.noorshomelab.dev/tags/quic/Recent content in QUIC on AI VOIDHugoenSun, 17 May 2026 00:00:00 +0000https://ai-blog.noorshomelab.dev/postmortems/quic-congestion-window-stalling-linux-kernel-idle-optimization-misport/Sun, 17 May 2026 00:00:00 +0000https://ai-blog.noorshomelab.dev/postmortems/quic-congestion-window-stalling-linux-kernel-idle-optimization-misport/<blockquote> <p><strong>Incident:</strong> QUIC Congestion Window Stalling Due to Linux Kernel Idle Optimization Misport <strong>Date:</strong> 2023-08-15 (Discovered) | <strong>Duration:</strong> Latent for years, ~6 hours (diagnosis &amp; fix deployment) | <strong>Severity:</strong> P1-high <strong>Affected:</strong> All Cloudflare QUIC connections utilizing the <code>quiche</code> library, impacting global user experience, especially after packet loss. <strong>Systems:</strong> Cloudflare <code>quiche</code> QUIC implementation, Linux kernel CUBIC porting layer, QUIC-enabled services. <strong>Root cause (summary):</strong> Incorrect calculation of &ldquo;idle&rdquo; periods in <code>quiche</code>&rsquo;s CUBIC congestion control port, preventing congestion window recovery after packet loss by perpetually resetting the idle timer.</p>