My Debian VPS has fluctuating latency
I'm a customer of a VPS host powered by HyperVM.
My issue is that my VPS is fluctuating in latency. One minute, it's very fast. The next, it slows down and takes 5 or more seconds to load a page.
Other users say there are definitely slow points for them.
My load average stays well below 1, and I've never seen it go above 1.5.
I have 128 mb ram, 50 of which is usually available.
This problem occurs any time, no matter how many users are connected.
My site uses mysql SELECT queries heavily. In fact the entire site interacts with a mysql database in some way.
I have properly indexed the tables that I SELECT from.
I have optimized and repaired my largest tables.
I have query cache enabled and gave it a generous quota.
Please help me further troubleshoot this problem. Thanks.