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tcp: increase tcp_limit_output_bytes default value to 4MB

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Last change happened in 2018 with commit c73e5807e4
("tcp: tsq: no longer use limit_output_bytes for paced flows")

Modern NIC speeds got a 4x increase since then.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250513193919.1089692-10-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2025-05-13 19:39:17 +00:00 committed by Jakub Kicinski
parent a00f135cd9
commit 9ea3bfa61b
2 changed files with 3 additions and 3 deletions
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2
Documentation/networking/ip-sysctl.rst
View File

@ -1099,7 +1099,7 @@ tcp_limit_output_bytes - INTEGER
limits the number of bytes on qdisc or device to reduce artificial
RTT/cwnd and reduce bufferbloat.
Default: 1048576 (16 * 65536)
Default: 4194304 (4 MB)
tcp_challenge_ack_limit - INTEGER
Limits number of Challenge ACK sent per second, as recommended

4
net/ipv4/tcp_ipv4.c
View File

@ -3495,8 +3495,8 @@ static int __net_init tcp_sk_init(struct net *net)
* which are too large can cause TCP streams to be bursty.
*/
net->ipv4.sysctl_tcp_tso_win_divisor = 3;
/* Default TSQ limit of 16 TSO segments */
net->ipv4.sysctl_tcp_limit_output_bytes = 16 * 65536;
/* Default TSQ limit of 4 MB */
net->ipv4.sysctl_tcp_limit_output_bytes = 4 << 20;
/* rfc5961 challenge ack rate limiting, per net-ns, disabled by default. */
net->ipv4.sysctl_tcp_challenge_ack_limit = INT_MAX;