[lkml]   [2008]   [Nov]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: time for TCP ECN defaulting to on?
From: Dave Hudson <>
Date: Tue, 04 Nov 2008 16:16:03 +0000

> Daniel J Blueman wrote:
> > Is it time to enable TCP ECN per default and get the benefits, since
> > router support has been around and known-about for really considerable
> > time?
> > Perhaps it should be a question of enabling it, and educating people
> > to disable it if they run into issues, since we'll probably be in the
> > same situation in 5 years...and it'll be some time before these
> > kernels hit devices/servers anyway.
> > Daniel
> Unfortunately I think you'll find there are sufficiently large
> numbers of broken SOHO routers out there that if you try this you'll
> cause a lot of problems. The problems range from no connectivity to
> in a few extreme cases routers actually crashing or behaving in very
> unpredictable ways. Here's one summary that got presented to the
> IETF about 18 months ago:

Another issue is that, even if we turn it on by default, it won't
be on for a significant number of network cards out there.

This is because TSO, which is on by default, doesn't support ECN
in many implementations.

 \ /
  Last update: 2008-11-04 23:55    [W:0.158 / U:0.140 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site