This file describes how to run the tcp_*_kern.o tcp_bpf (or socket_ops)
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programs. These programs attach to a cgroupv2. The following commands create
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a cgroupv2 and attach a bash shell to the group.
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mkdir -p /tmp/cgroupv2
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mount -t cgroup2 none /tmp/cgroupv2
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mkdir -p /tmp/cgroupv2/foo
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bash
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echo $$ >> /tmp/cgroupv2/foo/cgroup.procs
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Anything that runs under this shell belongs to the foo cgroupv2 To load
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(attach) one of the tcp_*_kern.o programs:
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./load_sock_ops -l /tmp/cgroupv2/foo tcp_basertt_kern.o
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If the "-l" flag is used, the load_sock_ops program will continue to run
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printing the BPF log buffer. The tcp_*_kern.o programs use special print
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functions to print logging information (if enabled by the ifdef).
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If using netperf/netserver to create traffic, you need to run them under the
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cgroupv2 to which the BPF programs are attached (i.e. under bash shell
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attached to the cgroupv2).
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To remove (unattach) a socket_ops BPF program from a cgroupv2:
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./load_sock_ops -r /tmp/cgroupv2/foo
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