Date: Mon, 20 Oct 2014 21:53:51 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r273343 - stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201410202153.s9KLrpDQ026056@svn.freebsd.org>
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Author: delphij Date: Mon Oct 20 21:53:51 2014 New Revision: 273343 URL: https://svnweb.freebsd.org/changeset/base/273343 Log: MFC r272507: MFV r272496: Add tunable for number of metaslabs per vdev (vfs.zfs.vdev.metaslabs_per_vdev). The default remains at 200. Illumos issue: 5161 add tunable for number of metaslabs per vdev Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c ============================================================================== --- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c Mon Oct 20 20:21:40 2014 (r273342) +++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c Mon Oct 20 21:53:51 2014 (r273343) @@ -156,6 +156,15 @@ static vdev_ops_t *vdev_ops_table[] = { /* + * When a vdev is added, it will be divided into approximately (but no + * more than) this number of metaslabs. + */ +int metaslabs_per_vdev = 200; +SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, metaslabs_per_vdev, CTLFLAG_RDTUN, + &metaslabs_per_vdev, 0, + "When a vdev is added, how many metaslabs the vdev should be divided into"); + +/* * Given a vdev type, return the appropriate ops vector. */ static vdev_ops_t * @@ -1663,9 +1672,9 @@ void vdev_metaslab_set_size(vdev_t *vd) { /* - * Aim for roughly 200 metaslabs per vdev. + * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev. */ - vd->vdev_ms_shift = highbit64(vd->vdev_asize / 200); + vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev); vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); }
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