SRCDS Steam group

Server FPS fluctuates a lot.
Server OS: Ubuntu 11.04 32bit
Processor: Dual Quad XEON 5520 2.26Ghz
Ram: 1GB
Game(s): Garry's Mod
Start Up Command:
echo "Starting GPK Server"
sleep 1
screen -A -m -d -S gmod-server ./srcds_run -console -game garrysmod +map gm_bigcity +maxplayers 32 +sv_lan 0 -debug -insecure +sv_defaultgamemode gpk +fps_max 66.66
Kernel: 2.6.32-6

Server is a VPS from BuyVM. fps_max is set to 66.66 but fps goes above 100, sometimes above 300. It also goes below 30. There are fps spikes which freeze the server for a short time. I can't get the FPS to stabilize, I just want it to stay at exactly 66 fps. srcds_linux is never using more than 15% cpu, so the CPU isn't a problem. It only uses about 10% of the RAM. Tested on multiple gamemodes with no difference, GPK, Sandbox, Base.

You can connect and use net_graph to see the FPS fluctuations:

I have tried the idler on lowest priority. With no change.
int main() {

fps_max doesn't appear to actually limit the fps.
It's a vps, that's why.

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