As　CPU　processing　speed　has　slowed　down　year-on-year,　heterogeneous　＂CPU-GPU＂　architectures　combining　multi-core　CPU　and　GPU　accelerators　have　become　increasingly　attractive.　Under　this　backdrop,　the　Heterogeneous　System　Architecture　(HSA)　standard　was　released　in　2012.　New　Accelerated　Processing　Unit　(APU)　architectures　-　AMD　Kaveri　and　Carrizo　-　were　released　in　2014　and　2015　respectively,　and　are　compliant　with　HSA.　These　architectures　incorporate　two　technologies　central　to　HSA,　hUMA　(heterogeneous　Unified　Memory　Access)　and　hQ　(heterogeneous　Queuing).　This　paper　summarizes　the　detailed　processes　of　hQ　by　analyzing　the　AMDKFD　kernel　source　code.　Furthermore,　this　paper　also　presents　hQ　performance　indexes　obtained　by　running　matrix-vector　multiplications　on　Kaveri　and　Carrizo　experiment　platforms.　The　experimental　results　show　that　hQ　can　prevent　the　system　from　falling　into　kernel　mode　as　much　as　possible　without　additional　overhead.　We　find　that　compared　with　Kaveri,　the　Carrizo　architecture　provides　better　HSA　performance.