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Subject: Re: svn commit: r242266 - head/sys/netinet
From: Rui Paulo <rpaulo@felyko.com>
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Date: Sun, 28 Oct 2012 14:03:08 -0700
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To: Andre Oppermann <andre@FreeBSD.org>
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On 28 Oct 2012, at 12:47, Andre Oppermann <andre@FreeBSD.org> wrote:

> Author: andre
> Date: Sun Oct 28 19:47:46 2012
> New Revision: 242266
> URL: http://svn.freebsd.org/changeset/base/242266
> 
> Log:
>  Increase the initial CWND to 10 segments as defined in IETF TCPM
>  draft-ietf-tcpm-initcwnd-05. It explains why the increased initial
>  window improves the overall performance of many web services without
>  risking congestion collapse.
> 
>  As long as it remains a draft it is placed under a sysctl marking it
>  as experimental:
>   net.inet.tcp.experimental.initcwnd10 = 1
>  When it becomes an official RFC soon the sysctl will be changed to
>  the RFC number and moved to net.inet.tcp.
> 
>  This implementation differs from the RFC draft in that it is a bit
>  more conservative in the case of packet loss on SYN or SYN|ACK because
>  we haven't reduced the default RTO to 1 second yet.  Also the restart
>  window isn't yet increased as allowed.  Both will be adjusted with
>  upcoming changes.
> 
>  Is is enabled by default.  In Linux it is enabled since kernel 3.0.


Didn't you also forget to point out the problems associated with it?

http://tools.ietf.org/html/draft-gettys-iw10-considered-harmful-00

Regards,
--
Rui Paulo