diff --git a/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c b/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
--- a/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
@@ -207,6 +207,7 @@
 hrtime_t	dtrace_unregister_defunct_reap = (hrtime_t)60 * NANOSEC;
 #ifndef illumos
 int		dtrace_memstr_max = 4096;
+int		dtrace_bufsize_max_frac = 128;
 #endif
 
 /*
@@ -12205,7 +12206,8 @@
 	 * ask to malloc, so let's place a limit here before trying
 	 * to do something that might well end in tears at bedtime.
 	 */
-	if (size > physmem * PAGE_SIZE / (128 * (mp_maxid + 1)))
+	int bufsize_percpu_frac = dtrace_bufsize_max_frac * mp_ncpus;
+	if (size > physmem * PAGE_SIZE / bufsize_percpu_frac)
 		return (ENOMEM);
 #endif
 
diff --git a/sys/cddl/dev/dtrace/dtrace_sysctl.c b/sys/cddl/dev/dtrace/dtrace_sysctl.c
--- a/sys/cddl/dev/dtrace/dtrace_sysctl.c
+++ b/sys/cddl/dev/dtrace/dtrace_sysctl.c
@@ -96,5 +96,9 @@
 SYSCTL_QUAD(_kern_dtrace, OID_AUTO, helper_actions_max, CTLFLAG_RW,
     &dtrace_helper_actions_max, 0, "maximum number of allowed helper actions");
 
+SYSCTL_INT(_kern_dtrace, OID_AUTO, bufsize_max, CTLFLAG_RWTUN,
+    &dtrace_bufsize_max_frac, 0,
+    "maximum fraction (1/n-th) of physical memory for principal buffers");
+
 SYSCTL_INT(_security_bsd, OID_AUTO, allow_destructive_dtrace, CTLFLAG_RDTUN,
     &dtrace_allow_destructive, 1, "Allow destructive mode DTrace scripts");