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Adapter configurations 92
adapter receives before generating an interrupt). A high value improves CPU efficiency, but may
reduce adapter bandwidth.
o Default = 1536
o Range = 0–4096 (increments of 32)
• Number of Coalesce Buffers (NC31xx adapters only). Specifies the number of memory buffers
available to the driver in case the driver runs out of available map registers. This buffer area is also
used when a packet consists of many fragments. If no coalesce buffers or map registers are
available, the driver is forced to queue the packet for later transmission. The preferred method of
transmitting data is to use map registers, because it is the most efficient method.
o Default = 8
o Range = 1–32
• Number of Receive Descriptors: Minimum/Maximum. Specifies the number of descriptors used by the
driver when copying data to the protocol memory. In high network load situations, increasing
receive descriptors can increase performance. The tradeoff is that this also increases the amount of
system memory used by the driver. If too few receive descriptors are used, performance suffers. If too
many receive descriptors are used, the driver unnecessarily consumes memory resources.
o Default = 48
o Range = 8–1024 (in increments of 8)
• Transmit Control Blocks. Specifies how many Transmit Control Blocks (TCBs) the driver allocates for
adapter use. This directly corresponds to the number of outstanding packets the driver can have in its
send queue. If too few TCBs are used, performance suffers. If too many TCBs are used, the driver
unnecessarily consumes memory resources.
o Default = 32
o Range = 1–64
• Adaptive Transmit Threshold. Determines how many bytes are in the FIFO before transmission
begins.
o Default = 200
o Range = 0–200
• Flow Control. The Flow Control property allows the user to enable or disable the receipt or
transmission of PAUSE frames. PAUSE frames enable the adapter and the switch to control the
transmit rate. The side that is receiving the PAUSE frame will momentarily stop transmitting. The
recommended selection is Off and it is the default setting. To disable Flow Control, select Off from
the Value list on the Advanced tab.
o Off. (Default) PAUSE frame receipt and transmission is disabled
o Generate. PAUSE frame transmission is enabled
o Respond. PAUSE frame receipt is enabled
o Both on. PAUSE frame receipt and transmission is enabled
HP NC110x, NC310F, NC340x, NC360x, NC364x, NC61xx, and NC71xx server adapters
• Speed/Duplex Setting. Changes the current speed and duplex settings. Be sure this setting is
compatible with the link partner (examples: switch, hub).
o Default
1000BASE-SX or -LX Adapters: Auto/Auto
10/100/1000 Adapters: Auto/Auto