-----BEGIN PGP SIGNED MESSAGE----- Hash: RIPEMD160 Hello *, man-pages version : 2.70 from http://www.kernel.org/pub/linux/docs/man-pages/ All required information were obtained by reading the kernel code/documentation. I'm not sure, whether it is completely bullet proof on when the sysctl variables/socket option first appeared in the kernel, so you might as well drop this information, but I'm pretty sure about how it works. Here we go with my patch: diff -ru man-pages-2.70/man7/tcp.7 man-pages-2.70.new/man7/tcp.7 - --- man-pages-2.70/man7/tcp.7 2007-11-24 14:33:34.000000000 +0100 +++ man-pages-2.70.new/man7/tcp.7 2007-12-12 16:34:52.000000000 +0100 @@ -177,8 +177,6 @@ .\" FIXME As at Sept 2006, kernel 2.6.18-rc5, the following are .\" not yet documented (shown with default values): .\" - -.\" /proc/sys/net/ipv4/tcp_congestion_control (since 2.6.13) - -.\" bic .\" /proc/sys/net/ipv4/tcp_moderate_rcvbuf .\" 1 .\" /proc/sys/net/ipv4/tcp_no_metrics_save @@ -224,6 +222,20 @@ are reserved for the application buffer. A value of 0 implies that no amount is reserved. +.TP +.BR tcp_allowed_congestion_control \ +" (String; default: cubic reno) (since 2.6.13) " +Show/set the congestion control choices available to non-privileged +processes. The list is a subset of those listed in +.IR tcp_available_congestion_control "." +Default is "cubic reno" and the default setting +.RI ( tcp_congestion_control ). +.TP +.BR tcp_available_congestion_control \ +" (String; default: cubic reno) (since 2.6.13) " +Lists the TCP congestion control algorithms available on the system. This value +can only be changed by loading/unloading modules responsible for congestion +control. .\" .\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt .TP @@ -257,6 +269,17 @@ Allows two flows sharing the same connection to converge more rapidly. .TP +.BR tcp_congestion_control " (String; default: cubic reno) (since 2.6.13) " +Determines the congestion control algorithm used for newly created TCP +sockets. By default Linux uses cubic with reno as fallback. If you want +to have more control over the algorithm used, you must enable the symbol +CONFIG_TCP_CONG_ADVANCED in your kernel config. +You can use +.BR setsockopt (2) +to individually change the algorithm on a single socket. +Requires CAP_NET_ADMIN or congestion algorithm to be listed in +.IR tcp_allowed_congestion_control "." +.TP .BR tcp_dsack " (Boolean; default: enabled)" Enable RFC\ 2883 TCP Duplicate SACK support. .TP @@ -649,7 +672,21 @@ socket options are valid on TCP sockets. For more information see .BR ip (7). - -.\" FIXME Document TCP_CONGESTION (new in 2.6.13) +.TP +.BR TCP_CONGESTION " (new since kernel version 2.6.13)" +If set to the name of an available congestion control algorithm, +it will henceforth be used for the socket. To get a list of +available congestion control algorithms, consult the sysctl variable +.IR net.ipv4.tcp_available_congestion_control "." +The algorithm that is used by default for all newly created +TCP sockets can be viewed/changed via the sysctl variable +.IR net.ipv4.tcp_congestion_control "." +If you feel, you are missing an algorithm in the list, +you may try to load the corresponding module using +.BR modprobe (8), +or if your kernel is built with module autoloading support +.RI ( CONFIG_KMOD ) +and the algorithm has been compiled as a module, it will be autoloaded. .TP .B TCP_CORK If set, don't send out partial frames. - -- Thomas -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHYADnUGqFG0l5Kr0RAyDDAJ9T/lIYEHk8MklyI8WY6VTHbhCtJwCdGl07 Ny/XbyN7UqTrnl9/6HjAQRk= =Yy8V -----END PGP SIGNATURE----- - To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
