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CHAPTER 5
Intel
®
NetStructure™ 470T and 470F Switches User Guide
Configure Advanced Switch Settings
Description
Head of Line (HOL) blocking prevention: If this option is enabled it
prevents the forwarding of data to a port that is blocked. Normally, when
the switch sends traffic out from a port, the data goes to the port’s transmit
queue and then is sent out. If the port’s transmit queue is already busy
trying to send out data the switch places the waiting traffic in the buffer
memory until the port is ready to send it out.
However, if the port’s transmit queue remains full, the switch fills up more
of the buffer with traffic waiting to be sent on that port. HOL blocking
works on the assumption that it is better to drop the traffic waiting in the
buffer than to continue using more memory and impacting performance
across all the ports.
High-priority packet service ratio: This option lets you determine how
many high-priority packets are sent out by the switch before sending a low-
priority packet. For example, a ratio of 8 high:1 low means that the switch
will send out eight high-priority packets before sending out one low-
priority packet.
LOCATION
Main Menu
Configure Device
Switch Settings
Configure Advanced...