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tc-policy: Mention XPS need to be disabled

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Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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Jesper Dangaard Brouer
2022-02-01 12:40:14 +01:00
parent f33789e4c6
commit 741205e13c
1 changed files with 13 additions and 0 deletions
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tc-policy/README.org
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@@ -29,6 +29,19 @@ the TC-hook, without depending on =tc= command util. Furthermore, the loader
uses =bpftool= skeleton feature (to generate a header file) allowing to create a
binary that contains the BPF-object itself, making it self-contained.
* Gotchas: XPS
For TXQ (=queue_mapping=) overwrite to work, you need to *disable* XPS (Transmit
Packet Steering), as XSP will have higher precedence than our BPF change to
=queue_mapping=. This is done by writing 0 into each =/sys/class/net/= tx-queue
file =/sys/class/net/DEV/queues/tx-*/xps_cpus=.
A script for configuring and disabling XPS is provided here: [[file:xps_setup_ash.sh]].
Script command line to disable XPS:
#+begin_src sh
sudo ./xps_setup_ash.sh --dev DEVICE --default --disable
#+end_src
* Different ways to view queue_mapping