User's Manual

Advanced User: Adjusting Default Firmware Settings 3-11
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A:\ Mptutil
The MPTUtil program identifies all LSI Logic host adapters in
the system, and allows you to select which adapter to update.
(See Figure 3.4.)
Step 2. The MPTUtil program displays a menu of options. (See
Figure 3.5.)
To change Interrupt Coalescing on the LSI7202XP-LC Port 0,
select the following menu option:
1- Change Interrupt Coalescing Values on Port 0
The current values are displayed within a submenu that allows the values
to be changed (Figure 3.6).
Figure 3.6 Interrupt Coalescing Values
Flags – By default, the host adapter has Interrupt Coalescing enabled,
as indicated by the Flags value of 0x0001. If you want to disable Interrupt
Coalescing, enter a value of 0x0000 for Flags. Interrupt Coalescing
should only be disabled to resolve issues in unique system
configurations. Consult LSI Logic Host Adapter Support to verify the
need to disable Interrupt Coalescing for specific system configurations.
When enabled, two parameters are relevant for interrupt coalescing:
Coalescing Depth – Specifies the number of I/Os that must complete
before a host interrupt is generated. For example, if set to 4, then the
adapter waits until four I/Os complete before notifying the host CPU via
the interrupt mechanism. You can decrease this value to improve system
performance if the system contains lower performance servers and/or
peripherals.
Coalescing Timeout – This is failsafe time period that specifies the
maximum amount of time (in milliseconds) to interrupt regardless of
Coalescing depth.