Intel 470 manual Configure Advanced Switch Settings

C H A P T E R 5 Intel® NetStructure™ 470T and 470F Switches User Guide

Configure Advanced Switch Settings

LOCATION

Main Menu

Configure Device

Switch Settings

Configure Advanced...

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.

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