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-rw-r--r--Documentation/networking/ip-sysctl.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 46c7e1085efc..3f2c40d8e6aa 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -606,6 +606,7 @@ tcp_fastopen_blackhole_timeout_sec - INTEGER
This time period will grow exponentially when more blackhole issues
get detected right after Fastopen is re-enabled and will reset to
initial value when the blackhole issue goes away.
+ 0 to disable the blackhole detection.
By default, it is set to 1hr.
tcp_syn_retries - INTEGER