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iflib: document new sysctls

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Document the new tx related sysctls I've added to iflib in the
last few months:  tx_reclaim_ticks & tx_reclaim_thresh

Sponsored by: Netflix
Reviewed by: ziaee
Differential Revision: https://reviews.freebsd.org/D54564
MFC after: 3 days
This commit is contained in:
Andrew Gallatin
2026-01-06 17:43:24 -05:00
parent ccec94bf63
commit 83e6f0d780
1 changed files with 10 additions and 0 deletions
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@@ -94,6 +94,16 @@ If set to a non-zero value, task returns immediately and the transmit
ring is serviced by a different task. ring is serviced by a different task.
This returns control to the caller faster and under high receive load, This returns control to the caller faster and under high receive load,
may result in fewer dropped RX frames. may result in fewer dropped RX frames.
.It Va tx_reclaim_thresh
Controls the threshold in packets before iflib will ask the driver
how many transmitted packets can be reclaimed.
Determining how many many packets can be reclaimed can be expensive
on some drivers.
.It Va tx_reclaim_ticks
Controls the time in ticks before iflib will ask the driver
how many transmitted packets can be reclaimed.
Determining how many many packets can be reclaimed can be expensive
on some drivers.
.It Va rx_budget .It Va rx_budget
Sets the maximum number of frames to be received at a time. Sets the maximum number of frames to be received at a time.
Zero (the default) indicates the default (currently 16) should be used. Zero (the default) indicates the default (currently 16) should be used.