From owner-svn-src-stable@freebsd.org  Sun Oct  1 14:58:45 2017
Return-Path: <owner-svn-src-stable@freebsd.org>
Delivered-To: svn-src-stable@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id F2A67E26A5E;
 Sun,  1 Oct 2017 14:58:44 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id C085C36FD;
 Sun,  1 Oct 2017 14:58:44 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v91EwibU091363;
 Sun, 1 Oct 2017 14:58:44 GMT (envelope-from avg@FreeBSD.org)
Received: (from avg@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id v91EwhV6091362;
 Sun, 1 Oct 2017 14:58:43 GMT (envelope-from avg@FreeBSD.org)
Message-Id: <201710011458.v91EwhV6091362@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: avg set sender to avg@FreeBSD.org
 using -f
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,
 svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject: svn commit: r324160 -
 stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
X-SVN-Group: stable-11
X-SVN-Commit-Author: avg
X-SVN-Commit-Paths: stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
X-SVN-Commit-Revision: 324160
X-SVN-Commit-Repository: base
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-stable@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: SVN commit messages for all the -stable branches of the src tree
 <svn-src-stable.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-stable>, 
 <mailto:svn-src-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-stable/>
List-Post: <mailto:svn-src-stable@freebsd.org>
List-Help: <mailto:svn-src-stable-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-stable>,
 <mailto:svn-src-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 01 Oct 2017 14:58:45 -0000

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