diff --git a/headers/private/graphics/common/perfmon_kernel.h b/headers/private/graphics/common/perfmon_kernel.h
deleted file mode 100644
index bffed0080c..0000000000
--- a/headers/private/graphics/common/perfmon_kernel.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/* ++++++++++
-	File:			perfmon_kernel.h
-	Description:	kernel mode interface to performance counters and time stamp 
-					registers of 586 and 686 CPUs
-
-	DO NOT use these functions in the production code !!! 
-	This interface WILL BE CHANGED in the next releases.	
-
-	Copyright (c) 1998 by Be Incorporated.  All Rights Reserved.
-+++++ */
-
-
-#ifndef	_PERFMON_KERNEL_H
-#define	_PERFMON_KERNEL_H
-
-#include <SupportDefs.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if __INTEL__
-
-extern _IMPEXP_KERNEL 		uint64	read_msr(uint32 msr); 
-extern _IMPEXP_KERNEL		void		write_msr(uint32 msr, uint64 val); 
-extern _IMPEXP_KERNEL 		uint64	read_pmc(uint32 pmc); 
-extern _IMPEXP_KERNEL 		uint64	read_tsc(void); 
-
-#endif
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/src/add-ons/kernel/drivers/graphics/common/log_coll.c b/src/add-ons/kernel/drivers/graphics/common/log_coll.c
index 811e749e50..f9dec1e79f 100644
--- a/src/add-ons/kernel/drivers/graphics/common/log_coll.c
+++ b/src/add-ons/kernel/drivers/graphics/common/log_coll.c
@@ -1,21 +1,21 @@
 /*
 	Copyright (c) 2002, Thomas Kurschel
 
-
 	Part of Radeon driver
-		
+
 	Both kernel and user space part.
 	(init and clean-up must be done in
 	kernel space).
 */
 
 
+#include "log_coll.h"
+
 #include <KernelExport.h>
+#include <OS.h>
+
 #include <stdlib.h>
 #include <stdarg.h>
-#include <perfmon_kernel.h>
-#include "log_coll.h"
-#include <OS.h>
 #include <string.h>
 
 typedef struct log_info_t {
@@ -47,7 +47,7 @@ void log( log_info *li, uint16 what, const uint8 num_args, ... )
 	
 	entry = (log_entry *)&li->log_buffer[pos];
 	
-	entry->tsc = read_tsc();
+	entry->tsc = system_time();
 	entry->what = what;
 	entry->num_args = num_args;