Revert "Increase readahead to 1024"

This reverts commit c42ac6a94bd3ecd018c9b0f5a07a99d06fc042de.
Revert "Misc tweaks"

This reverts commit b12c5a91d14dd07a1b798b1cd5e4a1f75b9f5e15.
Squashed update of kernel from 3.4.59 to 3.4.60