Date: Sun, 1 Oct 2017 14:58:43 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> 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 Message-ID: <201710011458.v91EwhV6091362@repo.freebsd.org>
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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
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