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

[Adolfo Santiago]

I could test from a UNIX box, but I don't have any kind of performance
baseline (even a subjective one) from that platform to compare to.  For the
last several weeks, we've been using RT strictly from Windows 2000 clients.

I guess it is possible that the performance gain is related to the number of
DNS lookups.  However, I don't know if it would be at the client side.
Everytime we sent a request to RT, we would see the httpd daemon come up
(using the top command) and stay up there the entire time the PC was waiting
to the response.  It's definitely something in Apache and/or one of the Perl
modules.  The daemon would stay running way after the MySQL daemon would
finish doing its job.

Chago


> -----Original Message-----
> From: Todd Chapman [mailto:rt at chaka.net]
> Sent: Monday, March 15, 2004 4:24 PM
> To: Adolfo Santiago
> Cc: rt-users at lists.bestpractical.com
> Subject: Re: [rt-users] Big performance gain from using FQDN??
>
>
> 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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> >
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