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

[Daniel Wittenberg]

Actually, windows does do some DNS caching, which you can flush using the 
command:

ipconfig /flushdns

Dan

Quoting Todd Chapman <rt at chaka.net>:

> 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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> > rt-users at lists.bestpractical.com
> > http://lists.bestpractical.com/mailman/listinfo/rt-users
> > 
> > Have you read the FAQ? The RT FAQ Manager lives at http://fsck.com/rtfm
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>