My kernel config had RAID6 compiled into the kernel. It is an
experimental option for kernel 2.6.9. At boot it measures the
checksumming performance of different algorithms.
Under Xen, the machine hangs when it executes the mmxx1 step - under
native linux, it works fine and goes on to mmxx2, ssex1, sse2x1 etc.
Not critical at all, just thought to let you guys know.