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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=9037

Slow performance when acessing an unresolved IP address through Apache mod_proxy module

Summary: Slow performance when acessing an unresolved IP address
through Apache mod_proxy module
Product: Apache httpd-1.3
Version: 1.3.24
Platform: PC
URL: http://65.123.25.70
OS/Version: Other
Status: NEW
Severity: Minor
Priority: Other
Component: mod_proxy
AssignedTo: bugs@httpd.apache.org
ReportedBy: fan_xia@hotmail.com


Hi,
Observed a slow performance when using mod_proxy to access an unresolved IP
address. I have setup a web site with the IP address only to test this issue
(http://65.123.25.70) . This is tested by Apache Windows installation. In
order to figure out the problem, I have run a debug in the Apache mod_proxy
source. The following is what I found:

(1)In 'ap_proxy_host2addr' function in the file
of 'proxy_util.c', 'gethostbyaddr' function call is slow because of the
unresolved IP address.

(2)comment out the function 'gethostbyaddr' and set hp=NULL seems fix this
performance issue.

(3)I didn't find any reason why we need to call 'gethostbyaddr' here. Further
analysis is required.

(4)If we do need to call 'gethostbyaddr', I suggest that we make a new
directive to turn on/off this behavior.

regard
Fan

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