Adjust SWITCH_RATIO for ZEN and apply GEMM_PREFERRED_SIZE

param.h

@@ -614,7 +614,13 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #define SYMV_P  8
 
-#define SWITCH_RATIO	16
+#if defined(XDOUBLE) || defined(DOUBLE)
+#define SWITCH_RATIO            4
+#define GEMM_PREFERED_SIZE      4
+#else
+#define SWITCH_RATIO            8
+#define GEMM_PREFERED_SIZE      8
+#endif
 
 #ifdef ARCH_X86