Tuning for high volume web traffic

I'm trying to get the best performance out of a high volume web cluster
reading through some system tuning parameters I came up with the following,
can anyone comment or give me better recommendations to use?

Thanks, these servers each have 4GB of memory and 2 - 3.6GHz HT CPU's

net.core.rmem._max = 16777216
net.core.wmem_max = 16777216
net.core.rmem_defualt = 16777216
net.core.wmem_defualt = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 87830 16777216
net.ipv4.tcp_max_syn_backlog = 4096
sys.net.core.netdev_max_backlog=2000

ifconfig eth0 txqueuelen 1024

--
Rodrick R. Brown
Senior IT Consultant
http://www.rodrickbrown.com
rodrick.brown[<@>]gmail.com

When in 1986 Apple bought a Cray X-MP and announced that they would use it
to design the next Apple Macintosh, Seymour Cray replied, "This is very
interesting because I am using an Apple Macintosh to design the Cray-2
supercomputer."

In comp.os.linux.misc Rodrick Brown <(E-Mail Removed)>:
> I'm trying to get the best performance out of a high volume web cluster
> reading through some system tuning parameters I came up with the following,
> can anyone comment or give me better recommendations to use?

> Thanks, these servers each have 4GB of memory and 2 - 3.6GHz HT CPU's

How much bandwidth to you have?

A system this powerful is able to saturate any usually available
bandwidth easily without any "performance tuning". Made some
tests (ab) on a system a bit slower sometime ago and it could
answer iirc about 17000 http requests/second to the test file
without any significant CPU usage and saturated the 100Mbit LAN
link completely.

I'd urge you to do some testing before suggesting any performance
enhancement, this isn't doze.

[..]

Good luck

--
Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
mail: echo (E-Mail Removed) | perl -pe 'y/a-z/n-za-m/'
#bofh excuse 189: SCSI's too wide.

Michael Heiming wrote:
> In comp.os.linux.misc Rodrick Brown <(E-Mail Removed)>:
>
>>I'm trying to get the best performance out of a high volume web cluster
>>reading through some system tuning parameters I came up with the following,
>>can anyone comment or give me better recommendations to use?
>
>
>>Thanks, these servers each have 4GB of memory and 2 - 3.6GHz HT CPU's
>
>
> How much bandwidth to you have?

Also, are the systems serving static content or dynamically generated
stuff? Static content (HTML files, JPEGs, etc.) requires very little in
terms of CPU and memory performance whereas dynamic content (Perl, PHP,
etc.) is a whole different ballgame (where optimizing the code can be of
greater importance than tuning the OS). If it's dynamic, does it use a
database and is the database on the same machine(s) or separate from the
webserver(s)?