So your VE current RAM usage is 171M since
(physpages*4096+kmemsize+allsocketbuf)/1024/1024=
=42568*4096+4761437+(142080+214188+17760+0)/1024/1024=
=179493993/1024/1024=171
Also since oomguarpages equals physpages (since no VE pages are swaped out by the kernel) the RAM+SWAP=RAM in your case.
Now total current allocated “virtual” (but not used) memory for VE is 1908MB(privvmpages*4096+kmemsize+allsocketbuf)/1024/1024=
=487310*4096+4761437+(142080+214188+17760+0)/1024/1024=
2001157225/1024/1024=1908MB
This huge difference is since your VE apps ask for too much memory but don't actually use it. For example i took a look at my VE with nginx webserver and php-cgi and it's RAM usage is 55M while “virtual” memory is 92M. So look in tool like htop to find which of the apps is asking for too much memory but not using it.
It's all in http://wiki.openvz.org/UBC_systemwide_configuration
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