On Tue, 2008-11-04 at 14:52 -0800, David Miller wrote: > 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. I think this is no longer a limitation. The GSO code will take care of ECN properly if the hardware does not support it when doing TSO. -- 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
