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→kernels with different versions
== kernels with different versions ==
* If you want to compare performance of the kernel on different hosts, or if you want to measure OpenVZ performance overhead, it's strongly recommended to compare the same kernel version with similar .config file and maybe with on the same linux distribution.
* If you compare kernels with different versions, please check all .config options that are differ, especially _DEBUG_ options. For example, on unixbench pipe throughput test on 2.6.18 kernel, disabled CONFIG_DEBUG_HIGHMEM option will increase performance up to <font color=red>20%</font>