svn commit: r260088 - head/sys/ufs/ffs

[Kirk McKusick]

Author: mckusick
Date: Mon Dec 30 17:04:24 2013
New Revision: 260088
URL: http://svnweb.freebsd.org/changeset/base/260088

Log:
  Fine tune filesystem block allocations under low free-space
  conditions (-r254995) based on further operational experience.
  
  Submitted by:  Dmitry Sivachenko
  Fix Tested by: Dmitry Sivachenko
  MFC after: 2 weeks

Modified:
  head/sys/ufs/ffs/ffs_alloc.c

Modified: head/sys/ufs/ffs/ffs_alloc.c
==============================================================================
--- head/sys/ufs/ffs/ffs_alloc.c	Mon Dec 30 16:49:31 2013	(r260087)
+++ head/sys/ufs/ffs/ffs_alloc.c	Mon Dec 30 17:04:24 2013	(r260088)
@@ -517,12 +517,12 @@ ffs_reallocblks_ufs1(ap)
 	fs = ip->i_fs;
 	ump = ip->i_ump;
 	/*
-	 * If we are not tracking block clusters or if we have less than 2%
+	 * If we are not tracking block clusters or if we have less than 4%
 	 * free blocks left, then do not attempt to cluster. Running with
 	 * less than 5% free block reserve is not recommended and those that
 	 * choose to do so do not expect to have good file layout.
 	 */
-	if (fs->fs_contigsumsize <= 0 || freespace(fs, 2) < 0)
+	if (fs->fs_contigsumsize <= 0 || freespace(fs, 4) < 0)
 		return (ENOSPC);
 	buflist = ap->a_buflist;
 	len = buflist->bs_nchildren;
@@ -744,12 +744,12 @@ ffs_reallocblks_ufs2(ap)
 	fs = ip->i_fs;
 	ump = ip->i_ump;
 	/*
-	 * If we are not tracking block clusters or if we have less than 2%
+	 * If we are not tracking block clusters or if we have less than 4%
 	 * free blocks left, then do not attempt to cluster. Running with
 	 * less than 5% free block reserve is not recommended and those that
 	 * choose to do so do not expect to have good file layout.
 	 */
-	if (fs->fs_contigsumsize <= 0 || freespace(fs, 2) < 0)
+	if (fs->fs_contigsumsize <= 0 || freespace(fs, 4) < 0)
 		return (ENOSPC);
 	buflist = ap->a_buflist;
 	len = buflist->bs_nchildren;