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| author | Haishuang Yan <yanhaishuang@cmss.chinamobile.com> | 2017-09-27 11:35:43 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-01 17:55:54 -0700 |
| commit | 3733be14a32bae288b61ed28341e593baba983af (patch) | |
| tree | 972622b76e08246aee043832bdc8224f6ac50501 /tools/perf/scripts/python/call-graph-from-sql.py | |
| parent | ipv4: Namespaceify tcp_fastopen_key knob (diff) | |
| download | linux-3733be14a32bae288b61ed28341e593baba983af.tar.gz linux-3733be14a32bae288b61ed28341e593baba983af.zip | |
ipv4: Namespaceify tcp_fastopen_blackhole_timeout knob
Different namespace application might require different time period in
second to disable Fastopen on active TCP sockets.
Tested:
Simulate following similar situation that the server's data gets dropped
after 3WHS.
C ---- syn-data ---> S
C <--- syn/ack ----- S
C ---- ack --------> S
S (accept & write)
C? X <- data ------ S
[retry and timeout]
And then print netstat of TCPFastOpenBlackhole, the counter increased as
expected when the firewall blackhole issue is detected and active TFO is
disabled.
# cat /proc/net/netstat | awk '{print $91}'
TCPFastOpenBlackhole
1
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-sql.py')
0 files changed, 0 insertions, 0 deletions