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Catching and debugging missing qdiscs is pretty tricky. When qdisc is deleted we replace it with a noop qdisc, which silently drops all the packets. Since the noop qdisc has a single static instance we can't count drops at the qdisc level. Count them as dev->tx_drops. ip netns add red ip link add type veth peer netns red ip link set dev veth0 up ip -netns red link set dev veth0 up ip a a dev veth0 10.0.0.1/24 ip -netns red a a dev veth0 10.0.0.2/24 ping -c 2 10.0.0.2 # 2 packets transmitted, 2 received, 0% packet loss, time 1031ms ip -s link show dev veth0 # TX: bytes packets errors dropped carrier collsns # 1314 17 0 0 0 0 tc qdisc replace dev veth0 root handle 1234: mq tc qdisc replace dev veth0 parent 1234:1 pfifo tc qdisc del dev veth0 parent 1234:1 ping -c 2 10.0.0.2 # 2 packets transmitted, 0 received, 100% packet loss, time 1034ms ip -s link show dev veth0 # TX: bytes packets errors dropped carrier collsns # 1314 17 0 3 0 0 Signed-off-by: Jakub Kicinski <kuba@kernel.org> Link: https://lore.kernel.org/r/20240529162527.3688979-1-kuba@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.