| Message ID | 4BE21D64.4040600@athenacr.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | stephen hemminger |
| Headers | show |
On Wed, 05 May 2010 21:37:40 -0400 Brian Bloniarz <bmb@athenacr.com> wrote: > Stephen Hemminger wrote: > > On Wed, 05 May 2010 16:56:34 -0400 > > Brian Bloniarz <bmb@athenacr.com> wrote: > > > >> dormando wrote: > >>>> This sounds like TCP slow start. > >>>> > >>>> http://en.wikipedia.org/wiki/Slow-start > >>>> > >>>> As far as tunables you might want to play with the initcwnd route > >>>> flag (see "ip route help") > >>> Ah, yes, initcwnd was it. I'm well aware of TCP Congestion control / slow > >>> start / etc. However I couldn't find the damn tunable for it :) > >> Documenting the flag in ip(8) might increase its visibility > >> a little. I don't see it documented in the iproute2 git head, > >> though it shows up on http://linux.die.net/man/8/ip somehow. > >> > >> Stephen, do you know why that is? > > > > No one sent me an official patch to change it? > > Mention initcwnd in ip(8). Text taken from doc/ip-cref.tex. > > Signed-off-by: Brian Bloniarz <bmb@athenacr.com> Ok, I will add it with an explicit caution about not doing this on public networks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, 05 May 2010 21:37:40 -0400 Brian Bloniarz <bmb@athenacr.com> wrote: > Stephen Hemminger wrote: > > On Wed, 05 May 2010 16:56:34 -0400 > > Brian Bloniarz <bmb@athenacr.com> wrote: > > > >> dormando wrote: > >>>> This sounds like TCP slow start. > >>>> > >>>> http://en.wikipedia.org/wiki/Slow-start > >>>> > >>>> As far as tunables you might want to play with the initcwnd route > >>>> flag (see "ip route help") > >>> Ah, yes, initcwnd was it. I'm well aware of TCP Congestion control / slow > >>> start / etc. However I couldn't find the damn tunable for it :) > >> Documenting the flag in ip(8) might increase its visibility > >> a little. I don't see it documented in the iproute2 git head, > >> though it shows up on http://linux.die.net/man/8/ip somehow. > >> > >> Stephen, do you know why that is? > > > > No one sent me an official patch to change it? > > Mention initcwnd in ip(8). Text taken from doc/ip-cref.tex. Applied -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/man/man8/ip.8 b/man/man8/ip.8 index a5d2915..777a0a7 100644 --- a/man/man8/ip.8 +++ b/man/man8/ip.8 @@ -211,7 +211,9 @@ replace " | " monitor " } " .B realms .IR REALM " ] [ " .B rto_min -.IR TIME " ]" +.IR TIME " ] [ " +.B initcwnd +.IR NUMBER " ]" .ti -8 .IR TYPE " := [ " @@ -1561,6 +1563,13 @@ the clamp for congestion window. It is ignored if the flag is not used. .TP +.BI initcwnd " NUMBER " "(2.5.70+ only)" +Initial congestion window size for connections to this destination. +Actual window size is this value multiplied by the MSS +(``Maximal Segment Size'') for same connection. The default is +zero, meaning to use the values specified in RFC2414. + +.TP .BI advmss " NUMBER " "(2.3.15+ only)" the MSS ('Maximal Segment Size') to advertise to these destinations when establishing TCP connections. If it is not given,