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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 9037] New: - Slow performance when acessing an unresolved IP address through Apache mod_proxy module
Date Mon, 13 May 2002 15:03:54 GMT
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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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