ADLINK Technology AdvancedMC AMC-8100, User Manual

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24 Fibre Channel Firmware Installation
depth of 9, with a timeout of 1280 (0x500) µs. This means that the
host is interrupted only once for 9 I/Os processed by the chip,
unless 1280 µs have passed since the host was last interrupted. If
the workload is of a large transfer length and sequential, LSI rec-
ommends that interrupt coalescing be disabled, to prevent perfor-
mance degradation.
Use the following procedure to adjust Interrupt Coalescing depth
and timeout values:
1. To set the link speed of the host adapter, execute this
command from DOS:
A:\ MPTutil
The MPTUtil program identifies all LSI host adapters in
the system, and allows you to select which adapter to
update. (Figure 4-4: MPTUtil Device Selection on page 20).
2. The MPTUtil program displays a menu of options (Figure 4-5:
MPTUtil Options on page 21). To change Interrupt Coalescing
on the AMC-8100 Port 0, select the following menu option:
1- Change Interrupt Coalescing Values on Port 0
The current values are displayed within a submenu, which
allows the values to be changed (see figure below).
Figure 4-6: Interrupt Coalescing Values
Flags
By default, the host adapter has Interrupt Coalescing enabled,
as indicated by the Flags value of 0x0001. If Interrupt Coalesc-
ing needs to be disabled, enter a value of 0x0000 for Flags.
CAUTION:
The AMC-8100 has two FC ports so Interrupt Coalescing must
be configured for each port.