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

[Todd Chapman]

I did a Goodle on "apache mod_perl FQDN speed" and this RT related post
was near the top and might be something worth looking at:

http://marc.free.net.ph/message/20030715.140530.b488b07a.html

-Todd

On Mon, Mar 15, 2004 at 09:00:02PM -0500, Adolfo Santiago wrote:
> 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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> >
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> 
> 
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