tcp: add tcp_comp_sack_delay_ns sysctl

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

Its default value is 1,000,000, or 1 ms to meet TSO autosizing period.

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, 7 insertions, 0 deletions

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 4b195bac8ac0..11fbfdc1566e 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -1152,6 +1152,13 @@ static struct ctl_table ipv4_net_table[] = {
                 .extra1         = &one,
         },
         {
+                .procname       = "tcp_comp_sack_delay_ns",
+                .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
+                .maxlen         = sizeof(unsigned long),
+                .mode           = 0644,
+                .proc_handler   = proc_doulongvec_minmax,
+        },
+        {
                 .procname       = "udp_rmem_min",
                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),