Index: fs/nfsclient/nfs_clbio.c
===================================================================
--- fs/nfsclient/nfs_clbio.c	(revision 250406)
+++ fs/nfsclient/nfs_clbio.c	(working copy)
@@ -1154,6 +1154,7 @@
 		if (bp->b_dirtyoff >= bp->b_dirtyend)
 			bp->b_dirtyoff = bp->b_dirtyend = 0;
 
+#if 0
 		/*
 		 * If the new write will leave a contiguous dirty
 		 * area, just update the b_dirtyoff and b_dirtyend,
@@ -1179,6 +1180,14 @@
 			}
 			goto again;
 		}
+#else
+		/*
+		 * Relax coherency a bit for the sake of performance and
+		 * expand the current dirty region to contain the new
+		 * write even if it means we mark some non-dirty data as
+		 * dirty.  This should probably be configurable.
+		 */
+#endif
 
 		local_resid = uio->uio_resid;
 		error = vn_io_fault_uiomove((char *)bp->b_data + on, n, uio);
Index: nfsclient/nfs_bio.c
===================================================================
--- nfsclient/nfs_bio.c	(revision 250406)
+++ nfsclient/nfs_bio.c	(working copy)
@@ -1133,6 +1133,7 @@
 		if (bp->b_dirtyoff >= bp->b_dirtyend)
 			bp->b_dirtyoff = bp->b_dirtyend = 0;
 
+#if 0
 		/*
 		 * If the new write will leave a contiguous dirty
 		 * area, just update the b_dirtyoff and b_dirtyend,
@@ -1158,6 +1159,14 @@
 			}
 			goto again;
 		}
+#else
+		/*
+		 * Relax coherency a bit for the sake of performance and
+		 * expand the current dirty region to contain the new
+		 * write even if it means we mark some non-dirty data as
+		 * dirty.  This should probably be configurable.
+		 */
+#endif
 
 		error = uiomove((char *)bp->b_data + on, n, uio);