Calls into skb:kfree_skb

README.md

Calls into skb:kfree_skb

As requested in netdev, this gist contains the stacks leading into skb:kfree_skb:

• https://lore.kernel.org/netdev/20230713201427.2c50fc7b@kernel.org/

The easiest way to look at the results is the flamegraphs, where reason is the top frame.

The results are from v6.1.38.

Normal (flamegraph.normal.svg + stacks.normal.txt)

We see ~10k calls per second during normal operation on this machine:

$ sudo perf record -a -g --kernel-callchains -e skb:kfree_skb -- sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 8.470 MB perf.data (9373 samples) ]

$ sudo perf script | sed -e 's/skb:kfree_skb:.*reason:\(.*\)/\n\tfffff \1 (unknown)/' -e 's/^\(\w\+\)\s\+/kernel /' | /usr/bin/inferno-collapse-perf --all | perl -pe 's/.*?;//' | sed -e 's/.*irq_exit_rcu_\[k\];/irq_exit_rcu_[k];/' | /usr/bin/inferno-flamegraph --truncate-text-right --colors=java --hash --title=normal --width=1440 --minwidth=0.005 > flamegraph.normal.svg

$ sudo /usr/share/bcc/tools/stackcount -s -K -D 1 t:skb:kfree_skb > stacks.normal.txt

Spike (flamegraph.spike.svg + stacks.spike.txt)

Spikes up to 500k calls per second can happen from time to time:

$ sudo perf record -a -g --kernel-callchains -e skb:kfree_skb -- sleep 1
[ perf record: Woken up 172 times to write data ]
Warning:
4 out of order events recorded.
[ perf record: Captured and wrote 124.722 MB perf.data (398819 samples) ]

$ sudo perf script | sed -e 's/skb:kfree_skb:.*reason:\(.*\)/\n\tfffff \1 (unknown)/' -e 's/^\(\w\+\)\s\+/kernel /' | /usr/bin/inferno-collapse-perf --all | perl -pe 's/.*?;//' | sed -e 's/.*irq_exit_rcu_\[k\];/irq_exit_rcu_[k];/' | /usr/bin/inferno-flamegraph --truncate-text-right --colors=java --hash --title=spike --width=1440 --minwidth=0.005 > flamegraph.spike.svg

$ sudo /usr/share/bcc/tools/stackcount -s -K -D 1 t:skb:kfree_skb > stacks.spike.txt

flamegraph.normal.packet_rcv.aggregated.svg

flamegraph.normal.svg

flamegraph.spike.packet_rcv.aggregated.svg

flamegraph.spike.svg

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y="591.50"></text></g><g><title>NOT_SPECIFIED (76 samples, 0.02%)</title><rect x="0.0268%" y="565" width="0.0191%" height="15" fill="rgb(90,237,90)" fg:x="107" fg:w="76"/><text x="0.2352%" y="575.50"></text></g><g><title>__napi_poll (20 samples, 0.01%)</title><rect x="0.0499%" y="725" width="0.0050%" height="15" fill="rgb(231,131,0)" fg:x="199" fg:w="20"/><text x="0.2582%" y="735.50"></text></g><g><title>mlx5e_napi_poll (20 samples, 0.01%)</title><rect x="0.0499%" y="709" width="0.0050%" height="15" fill="rgb(221,121,0)" fg:x="199" fg:w="20"/><text x="0.2582%" y="719.50"></text></g><g><title>net_rx_action (24 samples, 0.01%)</title><rect x="0.0499%" y="741" width="0.0060%" height="15" fill="rgb(244,144,0)" fg:x="199" fg:w="24"/><text x="0.2582%" y="751.50"></text></g><g><title>__sys_recvmsg (240 samples, 0.06%)</title><rect x="0.0000%" y="885" width="0.0602%" height="15" fill="rgb(227,127,0)" fg:x="0" fg:w="240"/><text x="0.2083%" y="895.50"></text></g><g><title>___sys_recvmsg (240 samples, 0.06%)</title><rect x="0.0000%" y="869" width="0.0602%" height="15" fill="rgb(223,123,0)" fg:x="0" fg:w="240"/><text x="0.2083%" y="879.50"></text></g><g><title>____sys_recvmsg (240 samples, 0.06%)</title><rect x="0.0000%" y="853" width="0.0602%" height="15" fill="rgb(223,123,0)" fg:x="0" fg:w="240"/><text x="0.2083%" y="863.50"></text></g><g><title>inet_recvmsg (239 samples, 0.06%)</title><rect x="0.0003%" y="837" width="0.0599%" height="15" fill="rgb(239,139,0)" fg:x="1" fg:w="239"/><text x="0.2086%" y="847.50"></text></g><g><title>udp_recvmsg (57 samples, 0.01%)</title><rect x="0.0459%" y="821" width="0.0143%" height="15" fill="rgb(234,134,0)" fg:x="183" fg:w="57"/><text x="0.2542%" y="831.50"></text></g><g><title>__skb_recv_udp (57 samples, 0.01%)</title><rect x="0.0459%" y="805" width="0.0143%" height="15" fill="rgb(227,127,0)" fg:x="183" fg:w="57"/><text x="0.2542%" y="815.50"></text></g><g><title>__local_bh_enable_ip (57 samples, 0.01%)</title><rect x="0.0459%" y="789" width="0.0143%" height="15" fill="rgb(233,133,0)" fg:x="183" fg:w="57"/><text x="0.2542%" y="799.50"></text></g><g><title>do_softirq (57 samples, 0.01%)</title><rect x="0.0459%" y="773" width="0.0143%" height="15" fill="rgb(243,143,0)" fg:x="183" fg:w="57"/><text x="0.2542%" y="783.50"></text></g><g><title>__do_softirq (57 samples, 0.01%)

stacks.normal.txt

stacks.spike.txt