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tc-cake: document 'ingress'

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Linux kernel commit 7298de9cd7255a783ba ("sch_cake: Add ingress mode") added
an ingress mode for CAKE, which can be enabled with the 'ingress' parameter.
Document the changes in CAKE's behavior when ingress mode is enabled.

Signed-off-by: Lương Việt Hoàng <tcm4095@gmail.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@kernel.org>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Lương Việt Hoàng 2024-08-12 11:41:37 +07:00 committed by Stephen Hemminger
parent 6e4c3ffb82
commit f7c2153058
1 changed files with 15 additions and 0 deletions
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15
man/man8/tc-cake.8
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@ -541,6 +541,21 @@ This can be used to set policies in a firewall script that will override CAKE's
built-in tin selection.
.SH OTHER PARAMETERS
.B ingress
.br
Indicates that CAKE is running in ingress mode (i.e. running on the downlink
of a connection). This changes the shaper to also count dropped packets as data
transferred, as these will have already traversed the link before CAKE can
choose what to do with them.
In addition, the AQM will be tuned to always keep at least two packets
queued per flow. The reason for this is that retransmits are more expensive in
ingress mode, since dropped packets have to traverse the link again; thus,
keeping a minimum number of packets queued will improve throughput in cases
where the number of active flows are so large that they saturate the link even
at their minimum window size.
.PP
.B memlimit
LIMIT
.br