Index: sys/fs/devfs/devfs_devs.c
===================================================================
--- sys/fs/devfs/devfs_devs.c
+++ sys/fs/devfs/devfs_devs.c
@@ -61,7 +61,7 @@
 static MALLOC_DEFINE(M_DEVFS3, "DEVFS3", "DEVFS data 3");
 static MALLOC_DEFINE(M_CDEVP, "DEVFS1", "DEVFS cdev_priv storage");
 
-static SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "DEVFS filesystem");
+SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "DEVFS filesystem");
 
 static unsigned devfs_generation;
 SYSCTL_UINT(_vfs_devfs, OID_AUTO, generation, CTLFLAG_RD,
Index: sys/fs/devfs/devfs_vnops.c
===================================================================
--- sys/fs/devfs/devfs_vnops.c
+++ sys/fs/devfs/devfs_vnops.c
@@ -57,6 +57,7 @@
 #include <sys/proc.h>
 #include <sys/stat.h>
 #include <sys/sx.h>
+#include <sys/sysctl.h>
 #include <sys/time.h>
 #include <sys/ttycom.h>
 #include <sys/unistd.h>
@@ -79,6 +80,12 @@
 struct mtx	cdevpriv_mtx;
 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
 
+SYSCTL_DECL(_vfs_devfs);
+
+static int devfs_dotimes;
+SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW,
+        &devfs_dotimes, 0, "Update timestamps on DEVFS");
+
 static int
 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
     int *ref)
@@ -1221,7 +1228,8 @@
 
 	foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
 	error = dsw->d_read(dev, uio, ioflag);
-	if (uio->uio_resid != resid || (error == 0 && resid != 0))
+	if (devfs_dotimes &&
+	    (uio->uio_resid != resid || (error == 0 && resid != 0)))
 		vfs_timestamp(&dev->si_atime);
 	td->td_fpop = fpop;
 	dev_relthread(dev, ref);
@@ -1700,7 +1708,8 @@
 	resid = uio->uio_resid;
 
 	error = dsw->d_write(dev, uio, ioflag);
-	if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
+	if (devfs_dotimes &&
+	    (uio->uio_resid != resid || (error == 0 && resid != 0))) {
 		vfs_timestamp(&dev->si_ctime);
 		dev->si_mtime = dev->si_ctime;
 	}