Performance tuning

Leonardo Santagostini lsantagostini at gmail.com
Mon Nov 26 19:25:44 UTC 2012


I see no problems.

[ec2-user at domU-12-31-39-06-2E-64 ~]$ time dig www.kentlaw.iit.edu

; <<>> DiG 9.7.0-P2-RedHat-9.7.0-5.P2.6.amzn1 <<>> www.kentlaw.iit.edu
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54160
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.kentlaw.iit.edu.           IN      A

;; ANSWER SECTION:
www.kentlaw.iit.edu.    86400   IN      A       64.131.119.9

;; Query time: 847 msec
;; SERVER: 200.51.197.187#53(200.51.197.187)
;; WHEN: Mon Nov 26 19:23:46 2012
;; MSG SIZE  rcvd: 53


*real    0m0.854s*
user    0m0.000s
sys     0m0.008s
[ec2-user at domU-12-31-39-06-2E-64 ~]$ time dig kentlaw.iit.edu

; <<>> DiG 9.7.0-P2-RedHat-9.7.0-5.P2.6.amzn1 <<>> kentlaw.iit.edu
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39163
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;kentlaw.iit.edu.               IN      A

;; ANSWER SECTION:
kentlaw.iit.edu.        86400   IN      A       64.131.119.9

;; Query time: 780 msec
;; SERVER: 200.51.197.187#53(200.51.197.187)
;; WHEN: Mon Nov 26 19:24:11 2012
;; MSG SIZE  rcvd: 49


*real    0m0.799s*
user    0m0.004s
sys     0m0.016s
[ec2-user at domU-12-31-39-06-2E-64 ~]$

Hope that helps.

regards
Saludos.-
Leonardo Santagostini

<http://ar.linkedin.com/in/santagostini>






2012/11/26 Chuck Swiger <cswiger at mac.com>

> Hi--
>
> On Nov 26, 2012, at 10:12 AM, Adamiec, Lawrence wrote:
> > The report must also address these two specific questions:
> >
> >       • Why does www.kentlaw.iit.edu load quicker than kentlaw.iit.eduin any browser?
> >       • What happens if we remove the forwarders option from named.conf?
> > I can't duplicate the issue in Q1 and I'm trying to determine a way of
> testing Q2.
>
> Q1 isn't related to DNS performance; both of the names you mention resolve
> to the same IP address via an A record.  There wasn't a significant
> difference in response time I saw by loading the webpages (both took ~1.3 s
> per curl), but one likely could improve webserver performance by running
> Apache, nginx, or almost anything else instead of than Microsoft's IIS.
>
> The domain seems to be missing A records for your nameservers, however:
>
>   http://www.dnsvalidation.com/reports/50b3b5167d79ee02b8000026
>
> As for Q2, it depends on whether the nameservers you are pointing to do
> better in caching queries then your local nameservers would doing recursive
> lookups for themselves.  If the local nameservers have poor connectivity
> compared to the forwarders, maybe, otherwise it's probably not helpful to
> use forwarders.
>
> Regards,
> --
> -Chuck
>
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