Any reason www.python.org is slow?
in [Python]
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From: Antoine Pitrou on 10 Jul 2010 10:17 On Sat, 10 Jul 2010 16:03:24 +0200 "Martin v. Loewis" <martin(a)v.loewis.de> wrote: > > That is a common myth. If your computer doesn't have any IPv6 > connectivity, all is fine. The web browser will fallback to IPv4 > immediately (*), without sending out any IPv6 datagrams first. Ok, I suppose the explanation wasn't factually exact. > If your computer does have IPv6 connectivity, but it's broken > (i.e. you have a gateway, but eventually packets are discarded), > you see the IPv4 fallback after the IPv6 timeout. The IPv4 connection in > itself then would be fast. I think it's what most users experience when they are talking about this problem. It manifests itself on many Linux setups. Regards Antoine.
From: Martin v. Loewis on 10 Jul 2010 10:28 >> If your computer does have IPv6 connectivity, but it's broken >> (i.e. you have a gateway, but eventually packets are discarded), >> you see the IPv4 fallback after the IPv6 timeout. The IPv4 connection in >> itself then would be fast. > > I think it's what most users experience when they are talking about > this problem. It manifests itself on many Linux setups. This (*) is something I really cannot believe. What specifically happened on these Linux setups? What specific network use these people, and why do they get bad IPv6 connectivity? Regards, Martin (*) that there are many
From: Antoine Pitrou on 10 Jul 2010 10:47 On Sat, 10 Jul 2010 16:28:19 +0200 "Martin v. Loewis" <martin(a)v.loewis.de> wrote: > >> If your computer does have IPv6 connectivity, but it's broken > >> (i.e. you have a gateway, but eventually packets are discarded), > >> you see the IPv4 fallback after the IPv6 timeout. The IPv4 connection in > >> itself then would be fast. > > > > I think it's what most users experience when they are talking about > > this problem. It manifests itself on many Linux setups. > > This (*) is something I really cannot believe. > (*) that there are many Well, just take a look at the number of recipes for disabling IPv6 specifically in order to solve slowdown problems: http://www.google.com/search?hl=fr&safe=off&q=linux+ipv6+disable+slowdowns&aq=f&aqi=&aql=&oq=&gs_rfai= It is at least the third time that someone asks why python.org is "slow", and that their problem is "solved" by disabling IPv6. I disabled IPv6 myself, which solved similar slowdown issues. The issues happened on *.python.org, *.google.com and a couple of other domains; hence they weren't python.org-specific. The issues happened with a Web browser but also with ssh; hence they were neither application- nor protocol-specific. The issues happened on two different machines, one hooked to a DSL router, another with wireless connection to various outside networks. Hence the issue is probably not tied to a particular hardware gateway. I was quite surprised myself when I discovered that "solution". But it really suppressed the frequent lag I had in some connection attempts (including ssh connection to a rather close, mostly idle box). It is possible that the way Linux (or some Linux setups: many of the recipes above are for Ubuntu, I use Mandriva myself) handles IPv6 "connectivity" is suboptimal in some cases, and that connection attempts don't fail immediately when they should. I don't have enough knowledge to diagnose further. Regards Antoine.
From: Pierre Rouleau on 10 Jul 2010 18:39 > > It is possible that the way Linux (or some Linux setups: many of the > recipes above are for Ubuntu, I use Mandriva myself) handles IPv6 > "connectivity" is suboptimal in some cases, and that connection > attempts don't fail immediately when they should. I don't have enough > knowledge to diagnose further. > > Note that I am not using Linux. I had the problem on OS/X 10.4. I did another experiment. I have VMWare Fusion on that computer and have Linux Ubuntu 9.04 in one VMWare appliance. I activated IPv6 on the OS/X Preference for the interface I am using. Access to www.python.org went slow for Firefox and Safari running directly under OS/X. However, access for Firefox running inside VMWare-based Linux Ubuntu 9.04 was fine! I tried pages from Ubuntu first, got them right away, then tried the same page under OS/X and was waiting for over 10 seconds. Regards - Pierre
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