Software: nginx/1.23.4. PHP/5.6.40-65+ubuntu20.04.1+deb.sury.org+1 

uname -a: Linux foro-restaurado-2 5.15.0-1040-oracle #46-Ubuntu SMP Fri Jul 14 21:47:21 UTC 2023
aarch64 

uid=33(www-data) gid=33(www-data) groups=33(www-data) 

Safe-mode: OFF (not secure)

/usr/src/linux-oracle-headers-5.15.0-1040/samples/bpf/   drwxr-xr-x
Free 83.31 GB of 96.73 GB (86.13%)
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Viewing file:     lwt_len_hist.sh (1.02 KB)      -rwxr-xr-x

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

NS1=lwt_ns1
VETH0=tst_lwt1a
VETH1=tst_lwt1b

TRACE_ROOT=/sys/kernel/debug/tracing

function cleanup {
	# To reset saved histogram, remove pinned map
	rm /sys/fs/bpf/tc/globals/lwt_len_hist_map
	ip route del 192.168.253.2/32 dev $VETH0 2> /dev/null
	ip link del $VETH0 2> /dev/null
	ip link del $VETH1 2> /dev/null
	ip netns exec $NS1 killall netserver
	ip netns delete $NS1 2> /dev/null
}

cleanup

ip netns add $NS1
ip link add $VETH0 type veth peer name $VETH1
ip link set dev $VETH0 up
ip addr add 192.168.253.1/24 dev $VETH0
ip link set $VETH1 netns $NS1
ip netns exec $NS1 ip link set dev $VETH1 up
ip netns exec $NS1 ip addr add 192.168.253.2/24 dev $VETH1
ip netns exec $NS1 netserver

echo 1 > ${TRACE_ROOT}/tracing_on
cp /dev/null ${TRACE_ROOT}/trace
ip route add 192.168.253.2/32 encap bpf out obj lwt_len_hist_kern.o section len_hist dev $VETH0
netperf -H 192.168.253.2 -t TCP_STREAM
cat ${TRACE_ROOT}/trace | grep -v '^#'
./lwt_len_hist
cleanup
echo 0 > ${TRACE_ROOT}/tracing_on

exit 0