Re: TCP_CONGESTION documentation

[Stephen Hemminger]

On Sat, 22 Nov 2008 15:56:32 +0100
Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> On Fri, Nov 21, 2008 at 11:39:18PM -0800, Stephen Hemminger wrote:
> > Does this help get it started in right direction??
> 
> Yes.
> 
> > --------------------------------------------
> > 
> >        This  is an implementation of the TCP protocol defined in
> >        RFC 793, RFC 1122 and RFC 2001 with the NewReno and  SACK
> >        extensions.   It  provides  a  reliable, stream-oriented,
> 
> Perhaps drop NewReno, it's really obsolete because Linux is so 
> far beyond.
> 
> > 
> >        Note that  TCP  actually  allocates twice the size of the
> >        buffer requested in
> 
> The "twice" is obsolete, it's far more complicated now.
> So it should be just "more" I think
> 
> >        socket  option  is  enabled,  urgent data is put into the
> >        normal data stream (a program can test for  its  location
> >        using the SIOCATMARK ioctl described below), otherwise it
> >        can be only received when the MSG_OOB  flag  is  set  for
> >        recv(2) or recvmsg(2).
> > 
> > Linux supports multiple different congestion control
> > algorithms. The default choice of congestion control is controlled
> > by net.ipv4.tcp_congestion_control sysctl. This value can
> > be overridden by TCP_CONGESTION socket option. The actual choices
> > of congestion control available vary according between release
> > as more are added, and depend on the configuration choices
> 
> Hmm perhaps mention the current standard default?

There is no "standard default" it is a kernel config option.
And it may change in future, so writing it into the manual page
seems being short sighted.
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