From: Dave Hudson <linux-kernel@xxxxxxxxxxxxx> 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. -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
