I have a VPS running Ubuntu 10.10, with a Django application running on top of it (MySQL database, Redis datastore, apache + mod_wsgi in daemon mode).
Over the last few days, we've been experiencing serious performance issues, with the server taking 1 minute+ to return a response.
This has just started happening over the past few days, before that we had no problems.
top says I'm using only 4-5% of my CPU,
free -m says I have over 700mb ram free.
What should my next steps be to understanding and solving the problem?