xend "sysctl operation failed"

[Aron Griffis <aron@hp.com>]

I'm seeing this failure trying to start xend:

==> xend-debug.log <==
Xend started at Wed Nov  7 09:30:01 2007.
sysctl operation failed -- need to rebuild the user-space tool set?
Exception starting xend: (13, 'Permission denied')

==> xend.log <==
[2007-11-07 09:30:01 3723] INFO (__init__:1072) Xend Daemon started
[2007-11-07 09:30:01 3723] INFO (__init__:1072) Xend changeset: Fri Nov 02 16:38:11 2007 +0000 16314:650cadd1b283.
[2007-11-07 09:30:01 3723] INFO (__init__:1072) Xend version: Unknown.
[2007-11-07 09:30:01 3723] ERROR (__init__:1072) Exception starting xend ((13, 'Permission denied'))
Traceback (most recent call last):
  File "//usr/lib/python/xen/xend/server/SrvDaemon.py", line 345, in run
    servers = SrvServer.create()
  File "//usr/lib/python/xen/xend/server/SrvServer.py", line 251, in create
    root.putChild('xend', SrvRoot())
  File "//usr/lib/python/xen/xend/server/SrvRoot.py", line 40, in __init__
    self.get(name)
  File "//usr/lib/python/xen/web/SrvDir.py", line 82, in get
    val = val.getobj()
  File "//usr/lib/python/xen/web/SrvDir.py", line 52, in getobj
    self.obj = klassobj()
  File "//usr/lib/python/xen/xend/server/SrvNode.py", line 30, in __init__
    self.xn = XendNode.instance()
  File "//usr/lib/python/xen/xend/XendNode.py", line 703, in instance
    inst = XendNode()
  File "//usr/lib/python/xen/xend/XendNode.py", line 83, in __init__
    self.other_config["xen_pagesize"] = self.xeninfo_dict()["xen_pagesize"]
  File "//usr/lib/python/xen/xend/XendNode.py", line 667, in xeninfo_dict
    return dict(self.xeninfo())
  File "//usr/lib/python/xen/xend/XendNode.py", line 617, in xeninfo
    info['xen_scheduler'] = self.xenschedinfo()
  File "//usr/lib/python/xen/xend/XendNode.py", line 607, in xenschedinfo
    sched_id = self.xc.sched_id_get()
Error: (13, 'Permission denied')

Anybody know what might be the problem here?  I'm sure the build is
good and matches the running hypervisor and kernel, which are csets
ia64/linux-2.6.18-xen.hg-210 and ia64/xen-unstable.hg-16314

Thanks,
Aron