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From: Jim Harris <jimharris@FreeBSD.org>
Date: Thu, 7 Jan 2016 15:57:18 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r293320 - head/sys/dev/nvd
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Author: jimharris
Date: Thu Jan  7 15:57:17 2016
New Revision: 293320
URL: https://svnweb.freebsd.org/changeset/base/293320

Log:
  nvd: do not wait for previous bios before submitting ordered bio
  
  Still wait until all in-flight bios (including the ordered bio)
  complete before processing more bios from the queue.
  
  MFC after:	3 days
  Sponsored by:	Intel

Modified:
  head/sys/dev/nvd/nvd.c

Modified: head/sys/dev/nvd/nvd.c
==============================================================================
--- head/sys/dev/nvd/nvd.c	Thu Jan  7 15:55:41 2016	(r293319)
+++ head/sys/dev/nvd/nvd.c	Thu Jan  7 15:57:17 2016	(r293320)
@@ -204,19 +204,6 @@ nvd_bioq_process(void *arg, int pending)
 		if (bp == NULL)
 			break;
 
-#ifdef BIO_ORDERED
-		/*
-		 * BIO_ORDERED flag dictates that all outstanding bios
-		 *  must be completed before processing the bio with
-		 *  BIO_ORDERED flag set.
-		 */
-		if (bp->bio_flags & BIO_ORDERED) {
-			while (ndisk->cur_depth > 0) {
-				pause("nvd flush", 1);
-			}
-		}
-#endif
-
 		bp->bio_driver1 = NULL;
 		atomic_add_int(&ndisk->cur_depth, 1);