Hitachi HF-W2000 Instruction Manual page 90

2. OPERATION
・
DMA Coalescing
Sets an upper limit on the maximum amount of latency applied to any network packet due to direct Memory
Access(DMA) Coalescing.
・Flow Control
This enables adapters to generate or respond to flow control frames, which help regulate
network traffic. The default setting of the flow control is different depending on the OS
and the type of LAN adapter in use. You must configure the flow control setting according
to the network you are using.
< NOTE >
・ If the LAN driver stops due to a system failure such as an OS deadlock,
broadcast frames from other devices may not be able to be processed and the
receive queue may get full.
If Rx Enabled or Rx & Tx Enabled is specified for Flow Control, flow control
frames are continuously sent from this equipment under such a condition. If
this happens, that may affect the whole network connected to the equipment.
Specify Disabled for Flow Control at this equipment or at the connected hub
as required.
・ If Disabled is specified for Flow Control and if the device receives frames
quicker than it can process, the device gets overloaded, and the
receive will be discarded until the device recovers from the overload condition.
You have to design the network appropriately to avoid such an overload
condition.
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frames