diff options
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/ip-sysctl.rst | 10 | ||||
| -rw-r--r-- | Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index f4ad739a6b53..bc9a01606daf 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -673,6 +673,16 @@ tcp_moderate_rcvbuf - BOOLEAN Default: 1 (enabled) +tcp_rcvbuf_low_rtt - INTEGER + rcvbuf autotuning can over estimate final socket rcvbuf, which + can lead to cache trashing for high throughput flows. + + For small RTT flows (below tcp_rcvbuf_low_rtt usecs), we can relax + rcvbuf growth: Few additional ms to reach the final (and smaller) + rcvbuf is a good tradeoff. + + Default : 1000 (1 ms) + tcp_mtu_probing - INTEGER Controls TCP Packetization-Layer Path MTU Discovery. Takes three values: diff --git a/Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst b/Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst index 5d5d54fb6ab1..beaf1880a19b 100644 --- a/Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst +++ b/Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst @@ -103,6 +103,7 @@ u8 sysctl_tcp_frto u8 sysctl_tcp_nometrics_save TCP_LAST_ACK/tcp_update_metrics u8 sysctl_tcp_no_ssthresh_metrics_save TCP_LAST_ACK/tcp_(update/init)_metrics u8 sysctl_tcp_moderate_rcvbuf read_mostly tcp_rcvbuf_grow() +u32 sysctl_tcp_rcvbuf_low_rtt read_mostly tcp_rcvbuf_grow() u8 sysctl_tcp_tso_win_divisor read_mostly tcp_tso_should_defer(tcp_write_xmit) u8 sysctl_tcp_workaround_signed_windows tcp_select_window int sysctl_tcp_limit_output_bytes read_mostly tcp_small_queue_check(tcp_write_xmit) |