kern/124991: [zfs] [patch] Add two new vfs.zfs.queue tunables

[Cy Schubert]

>Number:         124991
>Category:       kern
>Synopsis:       [zfs] [patch] Add two new vfs.zfs.queue tunables
>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:   Wed Jun 25 22:10:01 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 #1: Sun Jun 15 11:12:10 PDT 2008 root at cwsys:/export/obj/opt/src/cvs-stable7/src/sys/KOMQUATS i386


>Description:
Add two new tunables to vdev_queue.c, one being similar to a tunable in
Solaris /etc/system.
>How-To-Repeat:
N/A
>Fix:


 
--- sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c.orig	2008-04-16 18:23:33.000000000 -0700
+++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c	2008-06-25 14:35:19.000000000 -0700
@@ -43,6 +43,15 @@
 int zfs_vdev_max_pending = 35;
 int zfs_vdev_min_pending = 4;
 
+SYSCTL_DECL(_vfs_zfs_vdev);
+SYSCTL_NODE(_vfs_zfs_vdev, OID_AUTO, queue, CTLFLAG_RW, 0, "ZFS VDEV Queue");
+TUNABLE_INT("vfs.zfs.vdev.queue.max_pending", &zfs_vdev_max_pending);
+SYSCTL_INT(_vfs_zfs_vdev_queue, OID_AUTO, max_pending, CTLFLAG_RDTUN,
+    &zfs_vdev_max_pending, 0, "The maximum number of i/os concurrently pending to each device");
+TUNABLE_INT("vfs.zfs.vdev.queue.min_pending", &zfs_vdev_min_pending);
+SYSCTL_INT(_vfs_zfs_vdev_queue, OID_AUTO, min_pending, CTLFLAG_RDTUN,
+    &zfs_vdev_min_pending, 0, "The initial number of i/os pending to each device(before ramping up to max_pending)");
+
 /* deadline = pri + (lbolt >> time_shift) */
 int zfs_vdev_time_shift = 6;
 
>Release-Note:
>Audit-Trail:
>Unformatted: