AVX comes with Intels Sandy Bridge processors; maybe this list helps
Thanks! So no speedup is the expected behavior. Still it should work without strange messages, right?
In addition to the CPU side of things:
If AVX support wasn't backported to your kernel 2.6.18 should not support it. AVX support was introduced with kernel version 2.6.30 but I don't know what extra patches were applied to your kernel version.
One quick and dirty way to check if your CPU (and your kernel) supports AVX is this command: