I'm having an issue with load averages on my Debian GNU/Linux dedicated boxes. They are both (2 of them) running MySQL + a custom game server software - a smallish "MMORPG" (not massive at all). The CPU usage and memory usages are OK. CPU usage is usually < 5%. RAM usage does go up to something like 80 - 90% but there is always a bunch free, cached or buffered. Swap usage is 0.
While monitoring loads with uptime, top, or any other command that shows it, it randomly jumps up to something like 4 or even more. This is obviously an issue, especially considering both boxes "only" have 2 cores. After the magic jump of load average, it starts going down smoothly, suggesting it was a really temporary jump in resource usage. CPU usage is always 0-5%, at max 10%, whenever I've managed to stare at top at 1 second update frequency for about 15 minutes.
I've tried some tools like htop, vmstat, dstat etc. to no avail. Here is a log for anyone who is interested:
Apart from the occurence in the beginning lines, the CPU usage barely goes up while the load jumps to astronomic values. I'm no super-expert with this stuff, but writing 4KB to a disc doesn't sound like it could be a I/O bottleneck either.
I have also ran MySQL Tuning Primer Tool and it reports everything being fine.
Any ideas how to trace and solve the problem? Thanks!
Munin stats, updating about every 5 - 10 minutes.