diff --git a/difftest b/difftest
index ab7820f3..08260b42 160000
--- a/difftest
+++ b/difftest
@@ -1 +1 @@
-Subproject commit ab7820f33c72e45df0781d954931bef7f6da66dd
+Subproject commit 08260b420e8447c539056555eba14fda19c5d07f
diff --git a/src/main/scala/sim/NutShellSim.scala b/src/main/scala/sim/NutShellSim.scala
index 9f10463d..0cae1624 100644
--- a/src/main/scala/sim/NutShellSim.scala
+++ b/src/main/scala/sim/NutShellSim.scala
@@ -16,18 +16,12 @@
 
 package sim
 
-import system._
-import nutcore.NutCoreConfig
-
-import chisel3._
-import chisel3.util._
-import chisel3.util.experimental.BoringUtils
-
 import bus.axi4._
+import chisel3._
 import device.AXI4RAM
-import nutcore._
-import utils.GTimer
 import difftest._
+import nutcore.NutCoreConfig
+import system._
 
 class SimTop extends Module {
   lazy val config = NutCoreConfig(FPGAPlatform = false)
@@ -48,18 +42,5 @@ class SimTop extends Module {
   soc.io.meip := mmio.io.meip
 
   val difftest = DifftestModule.finish("nutshell")
-
-  val log_begin, log_end, log_level = WireInit(0.U(64.W))
-  log_begin := difftest.logCtrl.begin
-  log_end := difftest.logCtrl.end
-  log_level := difftest.logCtrl.level
-
-  assert(log_begin <= log_end)
-  BoringUtils.addSource(WireInit((GTimer() >= log_begin) && (GTimer() < log_end)), "DISPLAY_ENABLE")
-
-  // make BoringUtils not report boring exception when EnableDebug is set to false
-  val dummyWire = WireInit(false.B)
-  BoringUtils.addSink(dummyWire, "DISPLAY_ENABLE")
-
   difftest.uart <> mmio.io.uart
 }
diff --git a/src/main/scala/utils/Debug.scala b/src/main/scala/utils/Debug.scala
index 5384ca70..98fa133a 100644
--- a/src/main/scala/utils/Debug.scala
+++ b/src/main/scala/utils/Debug.scala
@@ -17,11 +17,9 @@
 package utils
 
 import chisel3._
-import chisel3.util._
-import chisel3.util.experimental.BoringUtils
-import utils.LogLevel.LogLevel
-
+import difftest.common.LogPerfControl
 import nutcore.NutCoreConfig
+import utils.LogLevel.LogLevel
 
 object LogLevel extends Enumeration {
   type LogLevel = Value
@@ -36,23 +34,17 @@ object LogLevel extends Enumeration {
 
 object LogUtil {
 
-  def displayLog: Bool = {
-    val enableDisplay = WireInit(false.B)
-    BoringUtils.addSink(enableDisplay, "DISPLAY_ENABLE")
-    enableDisplay
+  def control(): (Bool, UInt) = {
+    val control = LogPerfControl()
+    (control.logEnable, control.timer)
   }
 
-  // def LogLevel: UInt = {
-  //   val log_level = WireInit(0.U(64.W))
-  //   BoringUtils.addSink(log_level, "DISPLAY_LOG_LEVEL")
-  //   log_level
-  // }
-
   def apply(debugLevel: LogLevel)
            (prefix: Boolean, cond: Bool, pable: Printable)
            (implicit name: String): Any = {
-    val commonInfo = p"[${GTimer()}] $name: "
-    when (cond && displayLog) {
+    val c = control()
+    val commonInfo = p"[${c._2}] $name: "
+    when (cond && c._1) {
       if(prefix) printf(commonInfo)
       printf(pable)
     }
@@ -77,7 +69,7 @@ sealed abstract class LogHelper(val logLevel: LogLevel) {
   // NOOP/NutShell style debug
   def apply(flag: Boolean = NutCoreConfig().EnableDebug, cond: Bool = true.B)(body: => Unit): Any = {
     if(NutCoreConfig().EnhancedLog){
-      if(flag) { when (cond && LogUtil.displayLog) { body } }
+      if(flag) { when (cond && LogUtil.control()._1) { body } }
     } else {
       if(flag) { when (cond) { body } }
     }