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| <h1 align="center">Running a High-Performance Web Server for |
| HPUX</h1> |
| <pre> |
| Date: Wed, 05 Nov 1997 16:59:34 -0800 |
| From: Rick Jones <<a |
| href="mailto:raj@cup.hp.com">raj@cup.hp.com</a>> |
| Reply-To: raj@cup.hp.com |
| Organization: Network Performance |
| Subject: HP-UX tuning tips |
| </pre> |
| Here are some tuning tips for HP-UX to add to the tuning page. |
| |
| <p>For HP-UX 9.X: Upgrade to 10.20<br /> |
| For HP-UX 10.[00|01|10]: Upgrade to 10.20</p> |
| |
| <p>For HP-UX 10.20:</p> |
| |
| <p>Install the latest cumulative ARPA Transport Patch. This |
| will allow you to configure the size of the TCP connection |
| lookup hash table. The default is 256 buckets and must be set |
| to a power of two. This is accomplished with adb against the |
| *disc* image of the kernel. The variable name is tcp_hash_size. |
| Notice that it's critically important that you use "W" to write |
| a 32 bit quantity, not "w" to write a 16 bit value when |
| patching the disc image because the tcp_hash_size variable is a |
| 32 bit quantity.</p> |
| |
| <p>How to pick the value? Examine the output of <a |
| href="ftp://ftp.cup.hp.com/dist/networking/tools/connhist">ftp://ftp.cup.hp.com/dist/networking/tools/connhist</a> |
| and see how many total TCP connections exist on the system. You |
| probably want that number divided by the hash table size to be |
| reasonably small, say less than 10. Folks can look at HP's |
| SPECweb96 disclosures for some common settings. These can be |
| found at <a |
| href="http://www.specbench.org/">http://www.specbench.org/</a>. |
| If an HP-UX system was performing at 1000 SPECweb96 connections |
| per second, the TIME_WAIT time of 60 seconds would mean 60,000 |
| TCP "connections" being tracked.</p> |
| |
| <p>Folks can check their listen queue depths with <a |
| href="ftp://ftp.cup.hp.com/dist/networking/misc/listenq">ftp://ftp.cup.hp.com/dist/networking/misc/listenq</a>.</p> |
| |
| <p>If folks are running Apache on a PA-8000 based system, they |
| should consider "chatr'ing" the Apache executable to have a |
| large page size. This would be "chatr +pi L <BINARY>." |
| The GID of the running executable must have MLOCK privileges. |
| Setprivgrp(1m) should be consulted for assigning MLOCK. The |
| change can be validated by running Glance and examining the |
| memory regions of the server(s) to make sure that they show a |
| non-trivial fraction of the text segment being locked.</p> |
| |
| <p>If folks are running Apache on MP systems, they might |
| consider writing a small program that uses mpctl() to bind |
| processes to processors. A simple pid % numcpu algorithm is |
| probably sufficient. This might even go into the source |
| code.</p> |
| |
| <p>If folks are concerned about the number of FIN_WAIT_2 |
| connections, they can use nettune to shrink the value of |
| tcp_keepstart. However, they should be careful there - |
| certainly do not make it less than oh two to four minutes. If |
| tcp_hash_size has been set well, it is probably OK to let the |
| FIN_WAIT_2's take longer to timeout (perhaps even the default |
| two hours) - they will not on average have a big impact on |
| performance.</p> |
| |
| <p>There are other things that could go into the code base, but |
| that might be left for another email. Feel free to drop me a |
| message if you or others are interested.</p> |
| |
| <p>sincerely,</p> |
| |
| <p>rick jones<br /> |
| <a |
| href="http://www.cup.hp.com/netperf/NetperfPage.html">http://www.cup.hp.com/netperf/NetperfPage.html</a> |
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