I know this is such a familiar old question, but I'm a bit stumped.
I have a Rackspace virtual server running Fedora 14. It's a small machine, doing not a great deal (a test web site) with 256MB of RAM and 10GB of disk.
In the last few days it's started operating really slowly. It's slow in a terminal session, programs are taking a long time to run and the website is bogging now or becomes inoperable.
I've checked what I think are the obvious things - top isn't showing any heavy CPU load, there's free memory available and my Nagios monitoring isn't showing any load either.
I created the machine with Puppet and last night I created an 'identical' (I presume) machine that is running fine.
I've checked TCP to see if there's anything going in and out that might be a bottleneck and that's not revealed anything either.
Are there any other tips anyone can offer? I don't understand why it should be slow yet I can find no measurable evidence of this slowness other than what I experience.