diff options
| author | Stanislav Fomichev <sdf@google.com> | 2019-07-02 18:14:02 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-07-03 16:52:02 +0200 |
| commit | 395338843de1e47f6876e58adfe75b6483f96fff (patch) | |
| tree | 9d580787375a25bf8823d73e72be574b9059f056 /Documentation | |
| parent | selftests/bpf: test BPF_SOCK_OPS_RTT_CB (diff) | |
| download | linux-395338843de1e47f6876e58adfe75b6483f96fff.tar.xz linux-395338843de1e47f6876e58adfe75b6483f96fff.zip | |
samples/bpf: add sample program that periodically dumps TCP stats
Uses new RTT callback to dump stats every second.
$ mkdir -p /tmp/cgroupv2
$ mount -t cgroup2 none /tmp/cgroupv2
$ mkdir -p /tmp/cgroupv2/foo
$ echo $$ >> /tmp/cgroupv2/foo/cgroup.procs
$ bpftool prog load ./tcp_dumpstats_kern.o /sys/fs/bpf/tcp_prog
$ bpftool cgroup attach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog
$ bpftool prog tracelog
$ # run neper/netperf/etc
Used neper to compare performance with and without this program attached
and didn't see any noticeable performance impact.
Sample output:
<idle>-0 [015] ..s. 2074.128800: 0: dsack_dups=0 delivered=242526
<idle>-0 [015] ..s. 2074.128808: 0: delivered_ce=0 icsk_retransmits=0
<idle>-0 [015] ..s. 2075.130133: 0: dsack_dups=0 delivered=323599
<idle>-0 [015] ..s. 2075.130138: 0: delivered_ce=0 icsk_retransmits=0
<idle>-0 [005] .Ns. 2076.131440: 0: dsack_dups=0 delivered=404648
<idle>-0 [005] .Ns. 2076.131447: 0: delivered_ce=0 icsk_retransmits=0
Cc: Eric Dumazet <edumazet@google.com>
Cc: Priyaranjan Jha <priyarjha@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions