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Comments
@vanarp They also offer more RAM on openvz
It's likely due to the type of applications being run on KVM.
I am aware of memory problems with OpenVZ especially in the case of running mysql (innodb)/java. But, is there CPU problem too?
Not always.
KVM just has a lot more overhead. An idle KVM will take anywhere from 1 - 10% CPU just sitting there doing nothing, depending on the distro they install. There's unofficial limits of how many vcpu's you should sell per physical CPU before you're into sketchy times.
KVM allows overselling your RAM if you know how but you'll hit other walls that you can't use tricks around
Francisco
Are you suggesting that it is because of overselling possibility that OpenVZ plans have more CPU/RAM than Xen/KVM?
Openvz simply has less CPU overhead.
For OVZ of course. XEN supports ballooning but a customer can spot easily if they're being oversold. OVZ you can hide behind it and the OS will do its best to get you the RAM you're promised, even if it has to push the vast majority to the disk
It takes almost no CPU to run 100 openvz's idle doing nothing. You can't say the same for KVM or XEN since they crap out before that.
Francisco
/me looking at my InceptionHosting 8-cores Xen box.
@Francisco
Xen PV uses cpu when idle too?
Yep? The guests kernel is still ticking, crons are firing, etc.
Francisco
This =/
This happens everywhere lol