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rge: add disable_aspm tunable for PCIe power management

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Add a per-interface loader tunable dev.rge.%d.disable_aspm to
disable PCIe ASPM (L0s/L1) and ECPM on the RTL8125/8126/8127.

Disabling ASPM reduces latency at the cost of higher power
consumption. Default is off (ASPM left as configured by BIOS).

Signed-off-by: Christos Longros <chris.longros@gmail.com>

Reviewed by:	adrian
Differential Revision:	https://reviews.freebsd.org/D56103
This commit is contained in:
Christos Longros
2026-04-16 19:34:55 -07:00
committed by Adrian Chadd
parent aae9068404
commit 4390c37b5c
4 changed files with 27 additions and 16 deletions
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share/man/man4/rge.4
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@@ -152,6 +152,15 @@ Maximum number of RX packets to process per interrupt.
The default value is 16.
Increasing this value may improve throughput on high-speed links at the
cost of increased interrupt latency.
.It Va dev.rge.%d.disable_aspm
Disable PCIe Active State Power Management (ASPM) and Extended
Configuration Power Management (ECPM).
The default value is 0 (leave ASPM enabled).
Setting this to 1 reduces latency at the cost of increased power
consumption.
This tunable can only be set in
.Xr loader.conf 5
and requires a reboot to take effect.
.El
.Sh DIAGNOSTICS
.Bl -diag