Date: Wed, 19 Nov 2014 02:00:30 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Xin LI <delphij@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r274673 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <20141118220030.GA31347@zxy.spb.ru> In-Reply-To: <201411181840.sAIIe2C7094558@svn.freebsd.org> References: <201411181840.sAIIe2C7094558@svn.freebsd.org>
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On Tue, Nov 18, 2014 at 06:40:02PM +0000, Xin LI wrote: > Author: delphij > Date: Tue Nov 18 18:40:01 2014 > New Revision: 274673 > URL: https://svnweb.freebsd.org/changeset/base/274673 > > Log: > Allow tuning zfs_max_recordsize via loader tunable. Tuning is NOT > recommended. This is not tuning, this is simple guard. And can be safe changed (incrased, at the least) in any time. For some workload optimal is maximum, i.e. 16MB. May be better comment: increasing this value required strong understaning after-effects of increasing memory consumption and bulk data transfers. (sorry for english) > Requested by: Slawa Olhovchenkov <slw zxy spb ru> > MFC after: 2 weeks Thanks, can you allow RW? > Modified: > head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c > > Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c > ============================================================================== > --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Tue Nov 18 18:03:40 2014 (r274672) > +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Tue Nov 18 18:40:01 2014 (r274673) > @@ -51,6 +51,8 @@ > #include <sys/dsl_userhold.h> > #include <sys/dsl_bookmark.h> > > +SYSCTL_DECL(_vfs_zfs); > + > /* > * The SPA supports block sizes up to 16MB. However, very large blocks > * can have an impact on i/o latency (e.g. tying up a spinning disk for > @@ -61,6 +63,9 @@ > * of this setting. > */ > int zfs_max_recordsize = 1 * 1024 * 1024; > +SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RDTUN, > + &zfs_max_recordsize, 0, > + "Maximum block size. Expect dragons when tuning this."); > > #define SWITCH64(x, y) \ > { \ > _______________________________________________ > svn-src-all@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/svn-src-all > To unsubscribe, send any mail to "svn-src-all-unsubscribe@freebsd.org"
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