tcp: add tcp_comp_sack_nr sysctl

This per netns sysctl allows for TCP SACK compression fine-tuning.

This limits number of SACK that can be compressed.
Using 0 disables SACK compression.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 7ba952959bca..924bd51327b7 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -532,6 +532,12 @@ tcp_comp_sack_delay_ns - LONG INTEGER
 
         Default : 1,000,000 ns (1 ms)
 
+tcp_comp_sack_nr - INTEGER
+        Max numer of SACK that can be compressed.
+        Using 0 disables SACK compression.
+
+        Detault : 44
+
 tcp_slow_start_after_idle - BOOLEAN
         If set, provide RFC2861 behavior and time out the congestion
         window after an idle period.  An idle period is defined at