Hitachi HF-W2000 58 Instruction Manual page 79

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
Enables adapters to generate or respond to flow control frames, which help regulate network traffic. The default
setting for flow control differs depending on the OS and the type of LAN adapter being used. 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
might not be processed, and the receive queue might become full.
If Rx Enabled or Rx & Tx Enabled is specified for Flow Control, flow control frames are continuously sent
from this equipment under such conditions. If this happens, the entire network connected to the equipment
might be affected. Specify Disabled for Flow Control for this equipment or at the connected hub as required.
• If Disabled is specified for Flow Control and the device receives frames faster than it can process them, the
device becomes overloaded, and the received frames are discarded until the device recovers from the overload
condition. Design the network appropriately to avoid such overload conditions.
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