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congestion: avoid double-reducing CUBIC fast convergence (0.11.x)#2641

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congestion: avoid double-reducing CUBIC fast convergence (0.11.x)#2641
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Backport of #2640

Backport the CUBIC fast convergence fix to 0.11.x. Fast convergence adjusts W_max, but the loss reduction still applies to the old congestion window, not to the already-reduced W_max. Add a focused regression test for the 0.11.x field layout.
@djc djc changed the title congestion: avoid double-reducing CUBIC fast convergence congestion: avoid double-reducing CUBIC fast convergence (0.11.x) May 13, 2026
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djc commented May 14, 2026

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Trying to clean up the CI here:

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djc commented Jun 5, 2026

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Can you rebase? Or are you not interested in this backport?

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