From owner-svn-src-all@freebsd.org Wed Sep 20 08:36:32 2017 Return-Path: Delivered-To: svn-src-all@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 76B71E02A50; Wed, 20 Sep 2017 08:36:32 +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 43F0F29B5; Wed, 20 Sep 2017 08:36:32 +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 v8K8aVfq036211; Wed, 20 Sep 2017 08:36:31 GMT (envelope-from avg@FreeBSD.org) Received: (from avg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v8K8aVoT036210; Wed, 20 Sep 2017 08:36:31 GMT (envelope-from avg@FreeBSD.org) Message-Id: <201709200836.v8K8aVoT036210@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: avg set sender to avg@FreeBSD.org using -f From: Andriy Gapon Date: Wed, 20 Sep 2017 08:36:31 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r323797 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-SVN-Group: head X-SVN-Commit-Author: avg X-SVN-Commit-Paths: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-SVN-Commit-Revision: 323797 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Sep 2017 08:36:32 -0000 Author: avg Date: Wed Sep 20 08:36:31 2017 New Revision: 323797 URL: https://svnweb.freebsd.org/changeset/base/323797 Log: 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 Reported by: Sean Chittenden MFC after: 1 week Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c Wed Sep 20 08:27:21 2017 (r323796) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c Wed Sep 20 08:36:31 2017 (r323797) @@ -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