D29819.id87646.diff
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	Index: sys/kern/sys_pipe.c
	===================================================================
	--- sys/kern/sys_pipe.c
	+++ 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");
	@@ -222,6 +223,8 @@
	&piperesizefail, 0, "Pipe resize failures");
	SYSCTL_INT(_kern_ipc, OID_AUTO, piperesizeallowed, CTLFLAG_RW,
	&piperesizeallowed, 0, "Pipe resizing allowed");
	+SYSCTL_LONG(_kern_ipc, OID_AUTO, pipe_mindirect, CTLFLAG_RWTUN,
	+ &pipe_mindirect, 0, "Minimum write size triggering VM optimization");

	static void pipeinit(void *dummy __unused);
	static void pipeclose(struct pipe *cpipe);
	@@ -1140,8 +1143,8 @@
	* 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)