Brocade Communications Systems 415 - Manual (Page 50)

36 Brocade Adapters Administrator’s Guide
53-1001583-01
Advanced port configuration
3
Interrupt Control Coalesce
Interrupt control coalescing allows the system to optimize CPU utilization by varying the number of
interrupts generated. Increasing the latency monitor timeout value should result in a lower
interrupt count and less CPU utilization, which may result in higher throughput.
You can configure the following interrupt control coalescing parameters per port:
• Interrupt delay time - The host interrupt generation is delayed by the specified duration to
coalesce multiple I/O interrupt events into one. Increasing this value results in fewer interrupts
per multiple interrupt events.
• Interrupt latency timer - This value helps to minimize I/O latency by avoiding host interrupt
generation to have to wait until the interrupt delay has expired for an I/O throughput.
Configuring the Interrupt Control Coalesce using HCM
1. Select a port from the device tree.
• From the Host Connectivity Manager, select Configure > Advanced Port Configuration.
The Advanced Port Configuration dialog box displays.
OR
• Right-click a port and select Port Configuration > Advanced.
2. Set the latency and delay values:
• Select On from the Interrupt Control Coalesce list.
NOTE
Interrupt Control Coalesce is On by default.
• Specify the latency monitor timeout value in microseconds, if coalesce is set to on. Latency
timeout values supported are 0-225 microseconds for all HBAs, including the Brocade
804 mezzanine card. Setting the latency timeout value to 0 disables the latency monitor
time out interrupt.
• Specify the delay timeout value in microseconds, if coalesce is set to on. Delay timeout
values supported are 0-1125 microseconds for all HBAs, including the Brocade 804
mezzanine card. Setting the delay timeout value to 0 disables the latency monitor time out
interrupt.
3. Click OK.