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| author | Eric Dumazet <edumazet@google.com> | 2018-05-17 14:47:28 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-18 11:40:27 -0400 |
| commit | 6d82aa242092d73c6d2e210cfaf0ebfbe6de1ccf (patch) | |
| tree | 5babdd50e69dd7ab9b6db82f3b665d9c80be6bad /net/ipv4 | |
| parent | 200d95f4575934e49f872109cce18c5e72383eb8 (diff) | |
| download | linux-stable-6d82aa242092d73c6d2e210cfaf0ebfbe6de1ccf.tar.gz linux-stable-6d82aa242092d73c6d2e210cfaf0ebfbe6de1ccf.tar.bz2 linux-stable-6d82aa242092d73c6d2e210cfaf0ebfbe6de1ccf.zip | |
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>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/sysctl_net_ipv4.c | 7 | ||||
| -rw-r--r-- | net/ipv4/tcp_input.c | 4 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 1 |
3 files changed, 10 insertions, 2 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), diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index cc2ac5346b92..6a1dae38c955 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -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), diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index caf23de88f8a..a3f4647341db 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2572,6 +2572,7 @@ static int __net_init tcp_sk_init(struct net *net) init_net.ipv4.sysctl_tcp_wmem, sizeof(init_net.ipv4.sysctl_tcp_wmem)); } + net->ipv4.sysctl_tcp_comp_sack_delay_ns = NSEC_PER_MSEC; net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE; spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock); net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 60 * 60; |