D47398.diff
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	diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
	--- a/sys/kern/vfs_bio.c
	+++ b/sys/kern/vfs_bio.c
	@@ -1253,15 +1253,16 @@
	bufspacethresh = lobufspace + (hibufspace - lobufspace) / 2;

	/*
	- * Note: The 16 MiB upper limit for hirunningspace was chosen
	- * arbitrarily and may need further tuning. It corresponds to
	- * 128 outstanding write IO requests (if IO size is 128 KiB),
	- * which fits with many RAID controllers' tagged queuing limits.
	+ * Note: The upper limit for hirunningspace was chosen arbitrarily and
	+ * may need further tuning. It corresponds to 128 outstanding write IO
	+ * requests, which fits with many RAID controllers' tagged queuing
	+ * limits.
	+ *
	* The lower 1 MiB limit is the historical upper limit for
	* hirunningspace.
	*/
	hirunningspace = lmax(lmin(roundup(hibufspace / 64, maxbcachebuf),
	- 16 * 1024 * 1024), 1024 * 1024);
	+ 128 * maxphys), 1024 * 1024);
	lorunningspace = roundup((hirunningspace * 2) / 3, maxbcachebuf);

	/*