Messages in this thread | | | Date | Tue, 04 Nov 2008 14:52:42 -0800 (PST) | Subject | Re: time for TCP ECN defaulting to on? | From | David Miller <> |
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From: Dave Hudson <linux-kernel@blueteddy.net> 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: > > http://www.ietf.org/proceedings/07mar/slides/tsvarea-3/sld6.htm
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.
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