--- src/sys/kern/sys_pipe.c	2006/12/28 21:24:01	1.44
+++ src/sys/kern/sys_pipe.c	2008/05/04 08:42:03	1.45
@@ -157,7 +157,11 @@ static int pipe_maxcache = PIPEQ_MAX_CAC
 static int pipe_nbig;
 static int pipe_bcache_alloc;
 static int pipe_bkmem_alloc;
-static int pipe_dwrite_enable = 1;	/* 0:copy, 1:kmem/sfbuf 2:force */
+/*
+ * There's a bug in the sfbuf-based direct write code, not yet located.
+ * Disable it for now.
+ */
+static int pipe_dwrite_enable = 0;	/* 0:copy, 1:kmem/sfbuf 2:force */
 static int pipe_dwrite_sfbuf = 1;	/* 0:kmem_map 1:sfbufs 2:sfbufs_dmap */
 					/* 3:sfbuf_dmap w/ forced invlpg */