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More tcp_stdurg and SIOCATMARK work

This commit is contained in:
Michael Kerrisk 2005-06-20 14:45:09 +00:00
parent dd61d68cc4
commit 6f80235904
1 changed files with 22 additions and 16 deletions
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38
man7/tcp.7
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@ -198,7 +198,7 @@ A maximum of (window/2^tcp_app_win, mss) bytes in the window
are reserved for the application buffer. A value of 0 are reserved for the application buffer. A value of 0
implies that no amount is reserved. implies that no amount is reserved.
.\" .\"
.\" The following is from 2.6.12: Doumentation/networking/ip-sysctl.txt .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP .TP
.BR tcp_bic " (Boolean; default: disabled)" .BR tcp_bic " (Boolean; default: disabled)"
Enable BIC TCP congestion control algorithm. Enable BIC TCP congestion control algorithm.
@ -211,14 +211,14 @@ increment ensures linear RTT fairness as well as good
scalability. Under small congestion windows, binary search scalability. Under small congestion windows, binary search
increase provides TCP friendliness. increase provides TCP friendliness.
.\" .\"
.\" The following is from 2.6.12: Doumentation/networking/ip-sysctl.txt .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP .TP
.BR tcp_bic_low_window " (integer; default: 14)" .BR tcp_bic_low_window " (integer; default: 14)"
Sets the threshold window (in packets) where BIC TCP starts to Sets the threshold window (in packets) where BIC TCP starts to
adjust the congestion window. Below this threshold BIC TCP behaves adjust the congestion window. Below this threshold BIC TCP behaves
the same as the default TCP Reno. the same as the default TCP Reno.
.\" .\"
.\" The following is from 2.6.12: Doumentation/networking/ip-sysctl.txt .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP .TP
.BR tcp_bic_fast_convergence " (Boolean; default: enabled)" .BR tcp_bic_fast_convergence " (Boolean; default: enabled)"
Forces BIC TCP to more quickly respond to changes in congestion Forces BIC TCP to more quickly respond to changes in congestion
@ -244,7 +244,7 @@ the TCP specification, but required to prevent
denial-of-service attacks. denial-of-service attacks.
In Linux 2.2, the default value was 180. In Linux 2.2, the default value was 180.
.\" .\"
.\" The following is from 2.6.12: Doumentation/networking/ip-sysctl.txt .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP .TP
.BR tcp_frto " (Boolean; default: disabled)" .BR tcp_frto " (Boolean; default: disabled)"
Enables F-RTO, an enhanced recovery algorithm for TCP retransmission Enables F-RTO, an enhanced recovery algorithm for TCP retransmission
@ -273,7 +273,7 @@ of 75 seconds apart) when keep-alive is enabled.
Note that underlying connection tracking mechanisms and Note that underlying connection tracking mechanisms and
application timeouts may be much shorter. application timeouts may be much shorter.
.\" .\"
.\" The following is from 2.6.12: Doumentation/networking/ip-sysctl.txt .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP .TP
.BR tcp_low_latency " (Boolean; default: disabled)" .BR tcp_low_latency " (Boolean; default: disabled)"
If enabled, the TCP stack makes decisions that prefer lower If enabled, the TCP stack makes decisions that prefer lower
@ -425,13 +425,18 @@ in low-memory systems.
Enable RFC2018 TCP Selective Acknowledgements. Enable RFC2018 TCP Selective Acknowledgements.
.TP .TP
.BR tcp_stdurg " (Boolean; default: disabled)" .BR tcp_stdurg " (Boolean; default: disabled)"
Use the strict RFC793 interpretation of the TCP If this option is enabled, then use the "strict" RFC793 interpretation
urgent-pointer field. If this option is disabled, then use the of the TCP urgent-pointer field.
BSD-compatible interpretation of the urgent-pointer, pointing (RFC793 was ambiguous in its specification of the meaning of the
to the first byte after the urgent data. The RFC793 urgent pointer.
interpretation is to have it point to the last byte of urgent Here, the "strict" interpretation means the
data. Enabling this option may lead to interoperability one imposed by RFC961 and RFC1122.)
problems. According to this interpretation, the urgent pointer points
to the last byte of urgent data.
If this option is disabled, then use the BSD-compatible interpretation of
the urgent-pointer:
the urgent pointer points to the first byte after the urgent data.
Enabling this option may lead to interoperability problems.
.TP .TP
.BR tcp_synack_retries " (integer; default: 5)" .BR tcp_synack_retries " (integer; default: 5)"
The maximum number of times a SYN/ACK segment The maximum number of times a SYN/ACK segment
@ -470,7 +475,7 @@ Enabling this option is not
recommended since this causes problems when working recommended since this causes problems when working
with NAT (Network Address Translation). with NAT (Network Address Translation).
.\" .\"
.\" The following is from 2.6.12: Doumentation/networking/ip-sysctl.txt .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP .TP
.BR tcp_tw_reuse " (Boolean; default: disabled)" .BR tcp_tw_reuse " (Boolean; default: disabled)"
Allow to reuse TIME-WAIT sockets for new connections when it is Allow to reuse TIME-WAIT sockets for new connections when it is
@ -491,7 +496,7 @@ employed. If
is disabled, TCP will not negotiate the use of window is disabled, TCP will not negotiate the use of window
scaling with the other end during connection setup. scaling with the other end during connection setup.
.\" .\"
.\" The following is from 2.6.12: Doumentation/networking/ip-sysctl.txt .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP .TP
.BR tcp_vegas_cong_avoid " (Boolean; default: disabled)" .BR tcp_vegas_cong_avoid " (Boolean; default: disabled)"
Enable TCP Vegas congestion avoidance algorithm. Enable TCP Vegas congestion avoidance algorithm.
@ -501,7 +506,7 @@ adjusts the sending rate by modifying the congestion
window. TCP Vegas should provide less packet loss, but it is window. TCP Vegas should provide less packet loss, but it is
not as aggressive as TCP Reno. not as aggressive as TCP Reno.
.\" .\"
.\" The following is from 2.6.12: Doumentation/networking/ip-sysctl.txt .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
.TP .TP
.BR tcp_westwood " (Boolean; default: disabled)" .BR tcp_westwood " (Boolean; default: disabled)"
Enable TCP Westwood+ congestion control algorithm. Enable TCP Westwood+ congestion control algorithm.
@ -711,7 +716,8 @@ the urgent data (to actually read the urgent data requires the
flag). flag).
.sp .sp
Note that a read never reads across the urgent mark. Note that a read never reads across the urgent mark.
A program can thus advance up to the mark by performing reads Thus, having obtained notification of the presence of urgent data,
a program can advance up to the mark by performing reads
(requesting any number of bytes) and testing (requesting any number of bytes) and testing
.B SIOCATMARK .B SIOCATMARK
after each read. after each read.