Date: Fri, 06 Jun 2008 12:01:05 -0700 (PDT) From: Cy Schubert <cy@FreeBSD.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/124360: Add ZFS tunable Message-ID: <200806061901.m56J15Zi054345@cwsys.cwsent.com> Resent-Message-ID: <200806062010.m56KA1sn064347@freefall.freebsd.org>
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>Number: 124360
>Category: kern
>Synopsis: Add ZFS tunable
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Fri Jun 06 20:10:00 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator: Cy Schubert
>Release: FreeBSD-2.0
>Organization:
FreeBSD
>Environment:
System: FreeBSD cwsys 7.0-STABLE FreeBSD 7.0-STABLE #0: Mon Jun 2 18:59:51 PDT 2008 root@cwsys:/export/obj/opt/src/cvs-stable7/src/sys/KOMQUATS i386
>Description:
In order to assist tuning ZFS, add the tunable vfs.zfs.vdev.cache.bshift,
base 2 logarithm of the size used to read disks, simlar to the Solaris
/etc/system tunable.
>How-To-Repeat:
N/A
>Fix:
Index: sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_cache.c
===================================================================
RCS file: /home/ncvs/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_cache.c,v
retrieving revision 1.3
diff -u -r1.3 vdev_cache.c
--- sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_cache.c 28 Mar 2008 22:16:10 -0000 1.3
+++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_cache.c 6 Jun 2008 18:14:46 -0000
@@ -84,6 +84,9 @@
TUNABLE_INT("vfs.zfs.vdev.cache.size", &zfs_vdev_cache_size);
SYSCTL_INT(_vfs_zfs_vdev_cache, OID_AUTO, size, CTLFLAG_RDTUN,
&zfs_vdev_cache_size, 0, "Size of VDEV cache");
+TUNABLE_INT("vfs.zfs.vdev.cache.bshift", &zfs_vdev_cache_bshift);
+SYSCTL_INT(_vfs_zfs_vdev_cache, OID_AUTO, bshift, CTLFLAG_RDTUN,
+ &zfs_vdev_cache_bshift, 0, "Base 2 logarithm of the size used to read disks");
#define VCBS (1 << zfs_vdev_cache_bshift)
>Release-Note:
>Audit-Trail:
>Unformatted:
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