dlpi_max_ub_promisc.5 (2010 09)

d
dlpi_max_ub_promisc(5) dlpi_max_ub_promisc(5)
(Tunable Kernel Parameters)
NAME
dlpi_max_ub_promisc - maximum number of unbound promiscuous streams allowed on a LAN interface
VALUES
Failsafe
1
Default
1
Allowed values
1-16
Recommended values
1
DESCRIPTION
The dlpi_max_ub_promisc
tunable is used to dynamically increase or decrease the maximum
number of unbound promiscuous streams that can be opened on a LAN interface.
Enabling multiple unbound promiscuous streams may cause CPU utilization to increase up to three times
as compared to CPU utilization with no unbound promiscuous streams. Increasing the value of this tun-
able does not by itself degrade networking or kernel performance.
Who Is Expected to Change This Tunable?
Privileged user.
Restrictions on Changing
Changes to this tunable take effect immediately. When
dlpi_max_ub_promisc
’s value is reduced
from a higher value to a lower value, the existing unbound promiscuous streams will not be stopped to
accommodate the change. However, this tunable will limit the new unbound streams created on the
interface.
When Should the Value of This Tunable Be Raised?
This tunable should be raised when the number of unbound promiscuous applications needs to be more
than the default value.
What Are the Side Effects of Raising the Value?
Side effect may be an increase in CPU utilization.
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its
meaning changed in future releases of HP-UX.
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parame-
ter values. After installation, some tunable parameters may no longer be at the default or recommended
values. For information about the effects of installation on tunable values, consult the documentation for
the kernel software being installed. For information about optional kernel software that was factory
installed on your system, see HP-UX Release Notes at
http://www.hp.com/go/hpux-core-docs
.
AUTHOR
dlpi_max_ub_promisc was developed by HP.
SEE ALSO
kctune(1M), lanadmin(1M), gettune(2), settune(2), lan(7).
DLPI Programmer’s Guide on http://docs.hp.com.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1