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tcp: add tcp_comp_sack_nr sysctl

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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>
This commit is contained in:
Eric Dumazet 2018-05-17 14:47:29 -07:00 • committed by David S. Miller
parent 6d82aa2420
commit 9c21d2fc41
5 changed files with 20 additions and 1 deletions
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6
Documentation/networking/ip-sysctl.txt
View file

@ -532,6 +532,12 @@ tcp_comp_sack_delay_ns - LONG INTEGER
Default : 1,000,000 ns (1 ms) 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 tcp_slow_start_after_idle - BOOLEAN
If set, provide RFC2861 behavior and time out the congestion If set, provide RFC2861 behavior and time out the congestion
window after an idle period. An idle period is defined at window after an idle period. An idle period is defined at

1
include/net/netns/ipv4.h
View file

@ -160,6 +160,7 @@ struct netns_ipv4 {
int sysctl_tcp_pacing_ca_ratio; int sysctl_tcp_pacing_ca_ratio;
int sysctl_tcp_wmem[3]; int sysctl_tcp_wmem[3];
int sysctl_tcp_rmem[3]; int sysctl_tcp_rmem[3];
int sysctl_tcp_comp_sack_nr;
unsigned long sysctl_tcp_comp_sack_delay_ns; unsigned long sysctl_tcp_comp_sack_delay_ns;
struct inet_timewait_death_row tcp_death_row; struct inet_timewait_death_row tcp_death_row;
int sysctl_max_syn_backlog; int sysctl_max_syn_backlog;

10
net/ipv4/sysctl_net_ipv4.c
View file

@ -46,6 +46,7 @@ static int tcp_syn_retries_min = 1;
static int tcp_syn_retries_max = MAX_TCP_SYNCNT; static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
static int ip_ping_group_range_min[] = { 0, 0 }; static int ip_ping_group_range_min[] = { 0, 0 };
static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX }; static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
static int comp_sack_nr_max = 255;
/* obsolete */ /* obsolete */
static int sysctl_tcp_low_latency __read_mostly; static int sysctl_tcp_low_latency __read_mostly;
@ -1158,6 +1159,15 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644, .mode = 0644,
.proc_handler = proc_doulongvec_minmax, .proc_handler = proc_doulongvec_minmax,
}, },
{
.procname = "tcp_comp_sack_nr",
.data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &zero,
.extra2 = &comp_sack_nr_max,
},
{ {
.procname = "udp_rmem_min", .procname = "udp_rmem_min",
.data = &init_net.ipv4.sysctl_udp_rmem_min, .data = &init_net.ipv4.sysctl_udp_rmem_min,

3
net/ipv4/tcp_input.c
View file

@ -5106,7 +5106,8 @@ send_now:
return; return;
} }
if (!tcp_is_sack(tp) || tp->compressed_ack >= 44) if (!tcp_is_sack(tp) ||
tp->compressed_ack >= sock_net(sk)->ipv4.sysctl_tcp_comp_sack_nr)
goto send_now; goto send_now;
tp->compressed_ack++; tp->compressed_ack++;

1
net/ipv4/tcp_ipv4.c
View file

@ -2573,6 +2573,7 @@ static int __net_init tcp_sk_init(struct net *net)
sizeof(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_comp_sack_delay_ns = NSEC_PER_MSEC;
net->ipv4.sysctl_tcp_comp_sack_nr = 44;
net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE; net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock); spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock);
net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 60 * 60; net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 60 * 60;