0008076: libcurl 7.29 slow on dns resolution

ID	Project	Category	View Status	Date Submitted	Last Update

0008076	CentOS-7	curl	public	2015-01-14 12:36	2015-07-24 16:11

Reporter	schlitzered
Priority	high	Severity	major	Reproducibility	always
Status	new	Resolution	open
Platform	x86_64	OS	CentOS	OS Version	7.0.1406
Product Version	7.0-1406
Target Version		Fixed in Version

Summary	0008076: libcurl 7.29 slow on dns resolution
Description	libcurl adds ~ 150ms latency on each request compared to the version delivered in CentOS 6, or the one from Fedora 21 (7.37) I recognized the problem while moving a php application to a CentOS 7 server, where the applications was much slower. My current solution is that i have compiled the curl srpm from Fedora 21. Now the PHP application is running as usual.
Steps To Reproduce	# curl-format.txt # start of file time_namelookup: %{time_namelookup}\n time_connect: %{time_connect}\n time_appconnect: %{time_appconnect}\n time_pretransfer: %{time_pretransfer}\n time_redirect: %{time_redirect}\n time_starttransfer: %{time_starttransfer}\n ----------\n time_total: %{time_total}\n # end of file slow request (with name resolution): curl -4 -w '@curl-format.txt' www.google.de -> time_total: 0,052 fast request (without name resolution): curl -4 -w '@curl-format.txt' -H'Host: www.google.de' 74.125.24.94 -> time_total: 0,204
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Bock 2015-06-04 13:27 reporter ~0023300	I agreed with this, any request has taken for 0.150s delay.

dignus 2015-06-25 16:32 reporter ~0023490	It's due to a bug in libcurl in 7.29.0, but fixed later upstream, for more details: http://curl.haxx.se/mail/archive-2014-10/0037.html. Upgrading to 7.43.0 fixes the issue.

KlavsKlavsen 2015-07-06 08:28 reporter ~0023570	This one is biting us as well.. and a request that normally takes 50msecs on rhel6, takes 350msecs on centos 7 :( (and we do it several times a minute..) According to RH equivalent bug - it's fixed in newer version of 7.29 in fc19: https://bugzilla.redhat.com/show_bug.cgi?id=1130239 Also.. this bug seems to have been introduced by a bad backport by Red Hat.. according to http://curl.haxx.se/mail/archive-2014-10/0044.html

Date Modified	Username	Field
2015-01-14 12:36	schlitzered	New Issue
2015-06-04 13:27	Bock	Note Added: 0023300
2015-06-25 16:32	dignus	Note Added: 0023490
2015-07-06 08:28	KlavsKlavsen	Note Added: 0023570