diff --git linux/include/ihk/ihk_debug.h linux/include/ihk/ihk_debug.h
index 9b53dd7..305a3a9 100644
--- linux/include/ihk/ihk_debug.h
+++ linux/include/ihk/ihk_debug.h
@@ -8,7 +8,7 @@
 #ifndef IHK_DEBUG_H_INCLUDED
 #define IHK_DEBUG_H_INCLUDED
 
-#define IHK_KMSG_SIZE            8192
+#define IHK_KMSG_SIZE            (4UL<<20)
 #define IHK_KMSG_HIGH_WATER_MARK (IHK_KMSG_SIZE / 2)
 #define IHK_KMSG_NOTIFY_DELAY    400 /* Unit is us, 400 us would avoid overloading fwrite of ihkmond */