diff --git a/sys/kern/kern_umtx.c b/sys/kern/kern_umtx.c
--- a/sys/kern/kern_umtx.c
+++ b/sys/kern/kern_umtx.c
@@ -151,6 +151,26 @@
     &umtx_max_rb, 0,
     "Maximum number of robust mutexes allowed for each thread");
 
+static sbintime_t umtx_min_timeout;
+static int
+sysctl_umtx_min_timeout(SYSCTL_HANDLER_ARGS)
+{
+	int error, val;
+
+	val = sbttons(umtx_min_timeout);
+	error = sysctl_handle_int(oidp, &val, 0, req);
+	if (error != 0 || req->newptr == NULL)
+		return (error);
+	if (val < 0)
+		return (EINVAL);
+	umtx_min_timeout = nstosbt(val);
+	return (0);
+}
+SYSCTL_PROC(_kern_ipc, OID_AUTO, umtx_min_timeout,
+    CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_MPSAFE, NULL, 0,
+    sysctl_umtx_min_timeout, "U",
+    "Minimal timeout for umtx in nanoseconds");
+
 static uma_zone_t		umtx_pi_zone;
 static struct umtxq_chain	umtxq_chains[2][UMTX_CHAINS];
 static MALLOC_DEFINE(M_UMTX, "umtx", "UMTX queue memory");
@@ -759,6 +779,15 @@
 				*sbt += SBT_1S - rem;
 			break;
 		}
+		if (umtx_min_timeout != 0) {
+			struct bintime now;
+			sbintime_t when;
+
+			getbintime(&now);
+			when = bttosbt(now) + umtx_min_timeout;
+			if (*sbt < when)
+				*sbt = when;
+		}
 		*flags = C_ABSOLUTE;
 		return (0);