On Tue, 2008-10-28 at 16:30 -0500, David Miller wrote: > I have a CentOS 5.2 server running Apache 2.2.3 (yum installed) and > drupal 6.5 on ESX 3.5. We're using Name Based Virtual Hosting on it - > 2 hosts. The problem is that when I pull up a web page after not > having accessed it for ~15+ minutes it takes between 10-12s to load > fully. The 2nd page, 3rd page - and sometimes more than that - take > between 8-12 second. After that - decent performance, though not great > (0.3s to 2s). Wait ~15 minutes, maybe more, maybe less, and it goes > back to slow. While it's been most apparent with httpd, I've noticed > similar slowness with the initial ssh session, etc. > > I know what you're thinking. DNS problem, right? Yeah, me too. But for > the life of me I can't find a problem. This is at a colocation site > where we have other servers - all of those are just fine. We've got an > almost identical box internally - working just fine. I can do an > nslookup off of each of our different internal name servers and get > identical and immediate responses. > > I've done tcpdumps (both on the client and the server). It shows the > request gets to the server immediately. I've started httpd using > strace and not seen anything glaringly wrong (though I'm not well > versed in the output I have enough C under my belt to have an idea > what's going on). Thinking it was code that the developer working on > the project I pulled all the custom drupal modules out and it's still > slow. Even created another virtual host with a stock drupal install > and it's slow (identical results). I moved the mysql server from local > to our central DB server. Load avg never gets above ~0.10 so I don't > think the box is stressed. Watching the ESX load average it looks good > too. I've tried a hell of a lot of other things and tried to include > all the relevant information so apologies in advance for anything I > might have left out. > > > Thanks, > Dave > > Relevant info: > > uname -a: Linux internal-name.domainname.com 2.6.18-92.1.13.el5 #1 SMP > Wed Sep 24 19:33:52 EDT 2008 i686 i686 i386 GNU/Linux > > relevant portion of httpd.conf: > NameVirtualHost *:80 > > <VirtualHost *:80> > DocumentRoot /path/to/drupal-current > ServerName publicname.domainname.com > ErrorLog /path/to/logserror_log > CustomLog /path/to/logs/access_log common > </VirtualHost> > > /etc/hosts: > 127.0.0.1 localhost.localdomain localhost internal-name > 12.34.56.78 publicname.domainname.com > 12.34.56.79 db-server.domainname.com db-server ---- sounds sleepy - perhaps the mysql connections drop after inactivity and then it takes that long to connect You might just want to set up a cron script that does a curl or wget of a standard page every 2 minutes or so just to keep things active. Craig