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I am running into the problem described in this python issue.
Basically, whenever a python script attempts to handle an IPv6 response, there is a five-second delay.
I have followed the guidance on Disabling IPv6, which seems to deal with the problem for non-python applications.
For example, using curl, I get:
$ time -p curl http://www.archlinux.org/feeds/news/ > /dev/null
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 13564 100 13564 0 0 34543 0 --:--:-- --:--:-- --:--:-- 54039
real 0.39
user 0.00
sys 0.00
But then if i try this equivalent python script:
import urllib2
print urllib2.urlopen('http://www.archlinux.org/feeds/news/').read()
I get:
$ time -p python2 test.py > /dev/null
real 5.40
user 0.04
sys 0.01
The python issue linked above suggests a way to fix this problem, but the response from the python dev (martin v. loewis), was as follows:
I personally consider this not worth the effort. Unless there is a DNS problem, this cases shouldn't really be noticable, as the socket module will immediately report that IPv6 is not supported (without even consulting the operating system). So if there is a problem, it must be with DNS, in which case I would rather recommend to fix the DNS setup.
So, firstly, can anyone reproduce the five-second delay I am getting?
And, secondly, what, if anything, can be done to fix my DNS setup?
TIA
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