Earlier this week we delivered benchmarks of Ubuntu 9.04 versus Mac OS X 10.5.6 and found that the Leopard operating system had performed better than the Jaunty Jackalope in a majority of the tests, at least when it came to Ubuntu 32-bit. We are back with more operating system benchmarks today, but this time we are comparing the performance of the Linux and Sun OpenSolaris kernels. We had used the Nexenta Core Platform 2 operating system that combines the OpenSolaris kernel with a GNU/Ubuntu user-land to that of the same Ubuntu package set but with the Linux kernel. Testing was done with both 32-bit and 64-bit Ubuntu server installations.