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tcp: add tcp_comp_sack_delay_ns sysctl

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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>
This commit is contained in:
Eric Dumazet 2018-05-17 14:47:28 -07:00 • committed by David S. Miller
parent 200d95f457
commit 6d82aa2420
5 changed files with 18 additions and 2 deletions
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4
net/ipv4/tcp_input.c
View file

@ -5113,13 +5113,13 @@ send_now:
if (hrtimer_is_queued(&tp->compressed_ack_timer))
return;
/* compress ack timer : 5 % of rtt, but no more than 1 ms */
/* compress ack timer : 5 % of rtt, but no more than tcp_comp_sack_delay_ns */
rtt = tp->rcv_rtt_est.rtt_us;
if (tp->srtt_us && tp->srtt_us < rtt)
rtt = tp->srtt_us;
delay = min_t(unsigned long, NSEC_PER_MSEC,
delay = min_t(unsigned long, sock_net(sk)->ipv4.sysctl_tcp_comp_sack_delay_ns,
rtt * (NSEC_PER_USEC >> 3)/20);
sock_hold(sk);
hrtimer_start(&tp->compressed_ack_timer, ns_to_ktime(delay),