iflib: ignore reclaim coalescing when low on tx descriptors
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Authored by gallatin on Apr 9 2026, 11:35 PM.

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mjg
zlei
kgalazka
sumit.saxena_broadcom.com
shurd

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iflib

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rG52e7958702be: iflib: ignore reclaim coalescing when low on tx descriptors

Summary

If we are low on TX descriptors, bypass iflib_txq_can_reclaim() and force a reclaim. This is intended to reduce the number of output drops under heavy load when using simple transmit.

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rG FreeBSD src repository

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gallatin created this revision.Apr 9 2026, 11:35 PM

Herald added a reviewer: shurd. · View Herald TranscriptApr 9 2026, 11:35 PM

Herald added a reviewer: iflib. · View Herald Transcript

Herald added subscribers: glebius, melifaro, ae, imp. · View Herald Transcript

gallatin requested review of this revision.Apr 9 2026, 11:35 PM

This revision was not accepted when it landed; it landed in state Needs Review.Apr 17 2026, 5:35 PM

Closed by commit rG52e7958702be: iflib: ignore reclaim coalescing when low on tx descriptors (authored by gallatin). · Explain Why

This revision was automatically updated to reflect the committed changes.

gallatin added a commit: rG52e7958702be: iflib: ignore reclaim coalescing when low on tx descriptors.

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sys/

net/

iflib.c

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iflib: ignore reclaim coalescing when low on tx descriptorsClosedPublicActions