Index: /usr/src/sys/arch/amd64/amd64/k1x-pstate.c
===================================================================
RCS file: /home/cvs/src/sys/arch/amd64/amd64/k1x-pstate.c,v
retrieving revision 1.11
diff -u -p -u -p -r1.11 k1x-pstate.c
--- /usr/src/sys/arch/amd64/amd64/k1x-pstate.c	11 Aug 2021 18:31:48 -0000	1.11
+++ /usr/src/sys/arch/amd64/amd64/k1x-pstate.c	19 Apr 2022 06:19:42 -0000
@@ -40,6 +40,7 @@
 #endif
 
 extern int setperf_prio;
+extern int perflevel;
 
 #define MSR_K1X_LIMIT		0xc0010061
 #define MSR_K1X_CONTROL		0xc0010062
@@ -106,6 +107,10 @@ k1x_transition(struct k1x_cpu_state *cst
 		DELAY(100);
 	}
 	if (cfid == fid) {
+		if((perflevel == 100) && (cfid > 0)) {
+			printf("Request to set pstate %d ignored, due to perflevel 100.\n", cfid);
+			return;
+		}
 		cpuspeed = cstate->state_table[level].freq;
 #if 0
 		(void)printf("Target: %d Current: %d Pstate: %d\n",