Stas Bekman [EMAIL PROTECTED] wrote:
Also check the archives for 'lingerd' keyword. Here is what I've but it
didn't enter the guide yet, since it's waiting to be reviewed by Roger
Espel Llima, the author of lingerd. ...and waiting, and waiting, and
waiting :(
sorry, I've had a bunch of lingerd work in my todo list for so long,
and i haven't got around to doing it yet...
when you sent me the guide snippet to check, I felt like I wanted to
change some things, but now that I re-read it, the information seems
to be perfectly correct. I'd just switch the first two paragraphs
around, to start with the sentence that introduces where lingerd
fits in the Apache/mod_perl picture...
=head2 Closing Lingering Connections with Lingerd
Lingerd is a daemon (service) designed to take over the job of
properly closing network connections from an http server like Apache
and immediately freeing it to handle a new connection.
Because of some technical complications in TCP/IP, at the end of each
client connection, it is not enough for Apache to close the socket and
forget about it; instead, it needs to spend about one second
Ilingering on the client. (More details can be found at
http://httpd.apache.org/docs/misc/fin_wait_2.html)
Clingerd can only do an effective job if HTTP CKeep-Alives are
turned off; since CKeep-Alives are useful for images, the
recommended setup is to have Clingerd serving mod_perl enabled
Apache and plain Apache for images and other static objects.
With a Clingerd setup, you don't have the proxy, so the buffering
chain we have presented before for the proxy setup is much shorter
here:
FIGURE:
| Apache Kernel |TCP/IP `o'
| [mod_perl]=[sendbuf] |== /|\
| |/ \
Hence in this setup it becomes more important to have a big enough
kernel send buffer.
With lingerd, a big enough kernel send buffer, and keep-alives off,
the job of spoonfeeding the data to a slow client is done by the OS
kernel in the background. As a result, Clingerd makes it possible to
serve the same load using considerably fewer Apache processes. This
translates into a reduced load on the server. It can be used as an
alternative to the proxy setups we have seen so far.
For more information about Clingerd see:
http://www.iagora.com/about/software/lingerd/
Let me know if it was useful and correct, and I'll put it into the guide.
It is... sorry for the long delay.
--
Roger Espel Llima, [EMAIL PROTECTED]
http://www.iagora.com/~espel/index.html
