Kernbench provides elapsed time, user time, system time and cpu usage. Were were not able to set this test inside a vserver and an openvz guest due to probably bad guest installation. For example, our kernbench was designed to build a 2.6.7 kernel for a i386 target. In order to do that we need to build a cross compiler (with binutils and gcc) and that operation failed in our Debian Sarge Vserver guest.
Be aware that OpenVZ stable is based on a 2.6.8 kernel. So results can differ a lot from 2.6.16's ones.
Raw data can be find here, here, here and here. These files contains all the runs. More details on the environment used can be found here.