Replace the hw.ntb.enable_writecombine tunable with hw.ntb.default_mw_pat. It can be set with several specific numerical values to select a caching type. Any bogus value is treated as Uncacheable (UC). The ntb_mw_set_wc() KPI has removed the restriction that the selected mode must be one of UC, WC, or WB. Sponsored by: EMC / Isilon Storage Division