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From: Andriy Gapon <avg@FreeBSD.org>
Date: Sun, 1 Oct 2017 14:58:43 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r324160 -
 stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: avg
Date: Sun Oct  1 14:58:43 2017
New Revision: 324160
URL: https://svnweb.freebsd.org/changeset/base/324160

Log:
  MFC r323797: add vfs_zfs.abd_chunk_size tunable
  
  It is reported that the default value of 4KB results in a substantial
  memory use overhead (at least, on some configurations).  Using 1KB seems
  to reduce the overhead significantly.
  
  PR:		222377

Modified:
  stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c
==============================================================================
--- stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c	Sun Oct  1 14:50:58 2017	(r324159)
+++ stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c	Sun Oct  1 14:58:43 2017	(r324160)
@@ -150,6 +150,13 @@ boolean_t zfs_abd_scatter_enabled = B_TRUE;
  */
 size_t zfs_abd_chunk_size = 4096;
 
+#if defined(__FreeBSD__) && defined(_KERNEL)
+SYSCTL_DECL(_vfs_zfs);
+
+SYSCTL_ULONG(_vfs_zfs, OID_AUTO, abd_chunk_size, CTLFLAG_RDTUN,
+    &zfs_abd_chunk_size, 0, "The size of the chunks ABD allocates");
+#endif
+
 #ifdef _KERNEL
 extern vmem_t *zio_alloc_arena;
 #endif