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And if you can't run the newest version of DHCP... If your SAS
controller has a write cache, enable it. The bottleneck in your DHCP
server is likely disk. If you can remove that, you could probably serve
a few thousand lease per second with your CPU.<br>
<br>
-Blake<br>
<br>
-------- Original Message --------<br>
Subject: Re: DHCP Queue<br>
From: Brad Dameron <a class="moz-txt-link-rfc2396E" href="mailto:Brad.Dameron@clearwire.com"><Brad.Dameron@clearwire.com></a><br>
To: Users of ISC DHCP <a class="moz-txt-link-rfc2396E" href="mailto:dhcp-users@lists.isc.org"><dhcp-users@lists.isc.org></a><br>
Date: Thursday, February 12, 2009 11:26:07 AM<br>
<blockquote
cite="mid:6724EAC831AA6A4FBB9C93DFAD3A3BDC013A8558@corexchange3.corp.clearwire.com"
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<div id="idOWAReplyText19612" dir="ltr">
<div dir="ltr"><font color="#000000" face="Arial" size="2">You can
increase the lease per second substantually by going with 3.1.x and
using the hash adjustment I have posted on this list before. I have
gotten it into the 400 lps range with this. And I also tested with
DHCPperf tool as well as some other in house generated perl scripts.
Search the archive for my name.</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font face="Arial" size="2">Brad Dameron</font></div>
<div dir="ltr"><font face="Arial" size="2">Clearw're</font></div>
<div dir="ltr"><font face="Arial" size="2">Engineering</font></div>
<div dir="ltr"> </div>
</div>
<div dir="ltr"><br>
<hr tabindex="-1">
<font face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:dhcp-users-bounces@lists.isc.org">dhcp-users-bounces@lists.isc.org</a> on behalf of T MANIKANDAN-PKXR74<br>
<b>Sent:</b> Wed 2/4/2009 9:01 AM<br>
<b>To:</b> Users of ISC DHCP<br>
<b>Subject:</b> RE: DHCP Queue<br>
</font><br>
</div>
<div>
<div dir="ltr" align="left"><span class="869400017-04022009"><font
color="#0000ff" face="Arial" size="2">Hello can any one help to my
query mentioned below.</font></span></div>
<div dir="ltr" align="left"><span class="869400017-04022009"></span> </div>
<div dir="ltr" align="left"><span class="869400017-04022009"><font
color="#0000ff" face="Arial" size="2">Regards</font></span></div>
<div dir="ltr" align="left"><span class="869400017-04022009"><font
color="#0000ff" face="Arial" size="2">Mani</font></span></div>
<br>
<div class="OutlookMessageHeader" dir="ltr" align="left" lang="en-us">
<hr tabindex="-1"><font face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:dhcp-users-bounces@lists.isc.org">dhcp-users-bounces@lists.isc.org</a>
[<a class="moz-txt-link-freetext" href="mailto:dhcp-users-bounces@lists.isc.org">mailto:dhcp-users-bounces@lists.isc.org</a>] <b>On Behalf Of </b>T
MANIKANDAN-PKXR74<br>
<b>Sent:</b> Tuesday, February 03, 2009 7:30 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:dhcp-users@lists.isc.org">dhcp-users@lists.isc.org</a><br>
<b>Subject:</b> DHCP Queue<br>
</font><br>
</div>
<div><font face="Arial" size="2"><span class="375472613-03022009">Hi,</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009"></span></font> </div>
<div><font face="Arial" size="2"><span class="375472613-03022009">
We have a Network element AAA where it sends 250 clients per second to
aquire a Lease from ISC DHCP server. and I have seen that a 4 way quad
core AMD opteron processor/ SAS I/O drive with RHEL 5 and ISC DHCP
3.0.5 can handle upto 125 lease per second ( Result achieved from
Nominum DHCPperf tool).</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009"></span></font> </div>
<div><font face="Arial" size="2"><span class="375472613-03022009">
With total 135000 clients in my network it takes around 18 min to
complete the lease ( Time taken= (135000/125)/60 = 18 Minutes), W</span></font><font
face="Arial" size="2"><span class="375472613-03022009">hen my AAA
network element which is used for authentication and other purpose
finishes the job in approx 8 Minutes, while my DHCP server take 18
Minutes to complete the Job.</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009"></span></font> </div>
<div><font face="Arial" size="2"><span class="375472613-03022009">
Say at the end of 3 seconds, DHCP server gets a hit of 750
(250+250+250) Discover request while only 375 (125+125+125) is being
allocated an ip address and balance 375 will be in a
queue similarly.....</span></font><font face="Arial" size="2"><span
class="375472613-03022009"> </span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009">
at the end of 500 seconds, my DHCP server would have got aprox 135000
discover request and it has processed only approx 65000 request and
balance 75000 will be pending in the queue.</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009"></span></font> </div>
<div><font face="Arial" size="2"><span class="375472613-03022009">My
queries</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009"></span></font> </div>
<div><font face="Arial" size="2"><span class="375472613-03022009">How
long the client request will remain in queue </span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009">what
will be the maximum attempt the client will make to obtain the lease.</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009">What
will be the state of clients which are there in queue.</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009">Is
there any other Best solution in which my DHCP server can handle all
250 clients at a second </span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009">Can
i have 2 DHCP server in active active state handling different scopes
so that all 250 request are handled and there is no queue if so how the
lease file will be maintained.</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009"></span></font> </div>
<div><font face="Arial" size="2"><span class="375472613-03022009"></span></font> </div>
<div><font face="Arial" size="2"><span class="375472613-03022009">
Please help me understanding how the DHCP server handles this situation</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009"></span></font> </div>
<div><font face="Arial" size="2"><span class="375472613-03022009">Regards</span></font></div>
<div><font face="Arial" size="2"><span class="375472613-03022009">Mani</span></font></div>
</div>
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