User Guide

Table Of Contents
Range l Priority & VLAN Disabled
l Priority Enabled
l VLAN Enabled
l Priority & VLAN Enabled
Quality of Service
Quality of Service (QoS) allows the adapter to send and receive IEEE 802.3ac tagged frames. 802.3ac tagged
frames include 802.1p priority-tagged frames and 802.1Q VLAN-tagged frames. In order to implement QoS,
the adapter must be connected to a switch that supports and is configured for QoS. Priority-tagged frames
allow programs that deal with real-time events to make the most efficient use of network bandwidth. High
priority packets are processed before lower priority packets.
Tagging is enabled and disabled in Microsoft* Windows* Server* using the "QoS Packet Tagging" field in the
Advanced tab in Intel® PROSet. For other versions of the Windows operating system, tagging is enabled
using the "Priority/VLAN Tagging" setting on the Advanced tab in Inte PROSet.
Once QoS is enabled in Intel PROSet, you can specify levels of priority based on IEEE 802.1p/802.1Q frame
tagging.
The supported operating systems, including Microsoft* Windows Server*, have a utility for 802.1p packet
prioritization. For more information, see the Windows system help and Microsoft's knowledge base.
NOTE: The first generation Intel® PRO/1000 Gigabit Server Adapter (PWLA 8490) does not
support QoS frame tagging.
Receive Buffers
Defines the number of Receive Buffers, which are data segments. They are allocated in the host memory and
used to store the received packets. Each received packet requires at least one Receive Buffer, and each
buffer uses 2KB of memory.
You might choose to increase the number of Receive Buffers if you notice a significant decrease in the
performance of received traffic. If receive performance is not an issue, use the default setting appropriate to
the adapter.
Default 512, for the 10 Gigabit Server Adapters.
256, for all other adapters depending on the features selected.
Range 128-4096, in intervals of 64, for the 10 Gigabit Server Adapters.
80-2048, in intervals of 8, for all other adapters.
Recommended Value Teamed adapter: 256
Using IPSec and/or multiple features: 352