Date: Sat, 3 Oct 2015 11:05:59 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r288579 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201510031105.t93B5xB7057249@repo.freebsd.org>
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Author: mav Date: Sat Oct 3 11:05:58 2015 New Revision: 288579 URL: https://svnweb.freebsd.org/changeset/base/288579 Log: Restore original array_rd_sz semantics. Before r278702 prefetch was blocked for I/Os > 1MB, after -- >= 1MB. 1MB I/Os are used for bulk operations in CTL (XCOPY, VERIFY), and disabling prefetch for them reduced the performance. This is temporary local patch, that should be replaced when upstreamed. Discussed with: mahrens MFC after: 3 days Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c Sat Oct 3 09:47:29 2015 (r288578) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c Sat Oct 3 11:05:58 2015 (r288579) @@ -449,7 +449,7 @@ dmu_buf_hold_array_by_dnode(dnode_t *dn, } if ((flags & DMU_READ_NO_PREFETCH) == 0 && read && - length < zfetch_array_rd_sz) { + length <= zfetch_array_rd_sz) { dmu_zfetch(&dn->dn_zfetch, blkid, nblks); } rw_exit(&dn->dn_struct_rwlock);
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