D29819.diff
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	diff --git a/sys/kern/sys_pipe.c b/sys/kern/sys_pipe.c
	--- a/sys/kern/sys_pipe.c
	+++ b/sys/kern/sys_pipe.c
	@@ -209,6 +209,7 @@
	static int pipeallocfail;
	static int piperesizefail;
	static int piperesizeallowed = 1;
	+static long pipe_mindirect = PIPE_MINDIRECT;

	SYSCTL_LONG(_kern_ipc, OID_AUTO, maxpipekva, CTLFLAG_RDTUN \| CTLFLAG_NOFETCH,
	&maxpipekva, 0, "Pipe KVA limit");
	@@ -263,6 +264,29 @@
	KASSERT(pipedev_ino > 0, ("pipe dev inode not initialized"));
	}

	+static int
	+sysctl_handle_pipe_mindirect(SYSCTL_HANDLER_ARGS)
	+{
	+ int error = 0;
	+ long tmp_pipe_mindirect = pipe_mindirect;
	+
	+ error = sysctl_handle_long(oidp, &tmp_pipe_mindirect, arg2, req);
	+ if (error != 0 \|\| req->newptr == NULL)
	+ return (error);
	+
	+ /*
	+ * Don't allow pipe_mindirect to be set so low that we violate
	+ * atomicity requirements.
	+ */
	+ if (tmp_pipe_mindirect <= PIPE_BUF)
	+ return (EINVAL);
	+ pipe_mindirect = tmp_pipe_mindirect;
	+ return (0);
	+}
	+SYSCTL_OID(_kern_ipc, OID_AUTO, pipe_mindirect, CTLTYPE_LONG \| CTLFLAG_RW,
	+ &pipe_mindirect, 0, sysctl_handle_pipe_mindirect, "L",
	+ "Minimum write size triggering VM optimization");
	+
	static int
	pipe_zone_ctor(void mem, int size, void arg, int flags)
	{
	@@ -1140,8 +1164,8 @@
	* away on us.
	*/
	if (uio->uio_segflg == UIO_USERSPACE &&
	- uio->uio_iov->iov_len >= PIPE_MINDIRECT &&
	- wpipe->pipe_buffer.size >= PIPE_MINDIRECT &&
	+ uio->uio_iov->iov_len >= pipe_mindirect &&
	+ wpipe->pipe_buffer.size >= pipe_mindirect &&
	(fp->f_flag & FNONBLOCK) == 0) {
	error = pipe_direct_write(wpipe, uio);
	if (error != 0)