dlpi_max_ub_promisc(5)dlpi_max_ub_promisc(5)NAMEdlpi_max_ub_promisc - maximum number of unbound promiscuous streams
allowed on a LAN interface
The tunable is used to dynamically increase or decrease the maximum
number of unbound promiscuous streams that can be opened on a LAN
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 tunable does
not by itself degrade networking or kernel performance.
Who Is Expected to Change This Tunable?
Restrictions on Changing
Changes to this tunable take effect immediately. When 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.
All HP-UX kernel tunable parameters are release specific. This parame‐
ter may be removed or have its meaning changed in future releases of
Installation of optional kernel software, from HP or other vendors, may
cause changes to tunable parameter values. After installation, some
tunable parameters may no longer be at the default or recommended val‐
ues. For information about the effects of installation on tunable val‐
ues, consult the documentation for the kernel software being installed.
For information about optional kernel software that was factory
installed on your system, see at
was developed by HP.
SEE ALSOkctune(1M), lanadmin(1M), gettune(2), settune(2), lan(7).
DLPI Programmer's Guide on
Tunable Kernel Parameters dlpi_max_ub_promisc(5)