Run $ USE="experimental" emerge =sys-kernel/gentoo-sources-4.1.2 $ cd /usr/src/linux/linux-4.1.2-gentoo $ make menuconfig Navigate to Enable the block layer → IO Schedulers → See no BFQ.
Because, at the time, there is NO BFQ yet for 4.1. It will be in for the next release. http://dev.gentoo.org/~mpagano/genpatches/trunk/4.1/