[rt-users] Big performance gain from using FQDN??

[Todd Chapman]

I don't think Windows caches DNS lookups. Maybe using the FQDN
causes one or two fewer lookups to be performed. Can you test
the speen difference from a Unix box?

-Todd

On Mon, Mar 15, 2004 at 05:02:10PM -0500, Adolfo Santiago wrote:
> Yesterday, we changed the way we access our internal RT server.  We used to
> go with http://rt, but now we go with http://rt.ourdomain.com.
> 
> Since then, performance has increased tremendously!  I mean, tickets that
> used to take 10-15 seconds to open, now open in 3-4 seconds.
> 
> Has anyone experienced this?
> 
> We host our own (dual server) DNS and "RT" is an alias (CNAME) for the
> server it runs on (it's not a separate server).  Apache is set up as
> follows:
> 
> ServerName rt
> ServerPath /rt
> Options -Indexes
> TransferLog /var/log/httpd/rt.access_log
> ErrorLog /var/log/httpd/rt.error_log
> UserDir disabled
> ScriptAlias /cgi-bin/ /home/httpd/prodcgi-bin/rt/
> ServerAlias rt
> 
> >From a DNS perspective, and Apache's use of it, we don't see any reason for
> the increase in performance.
> 
> Our domain DOES have a Squid proxy and that proxy runs on the same server RT
> runs ("Aha!", you say, "That's it!").  HOWEVER, we have the browsers set to
> bypass the proxy for internal servers.  Plus, looking at the cache's stats,
> after hours us constant use today, the only RT object cached is:
> 
> GET http://rt.ourdomain.com/NoAuth/images//bplogo.gif
> 
> SQUID is set to NOT cache "query" URLs (e.g.,
> http://xyz.abc.com/cgi-bin/cgiprog?query=here).
> 
> Also, the 3-4 second ticket open time was measured after clearing the Squid
> and browser caches.
> 
> Are we missing something obvious here?  If not, could using the alias name
> (instead of the FQDN) really be affecting performance that much?
> 
> Basic stats:
> 
> RT 3.0.8
> Perl 5.8.0
> MySQL 3.23.58
> 
> Chago
> 
> 
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