LSI 7102XP-LC, 7102XP-LC, 7102LXP-LC, 7202XP-LC, 7202LXP-LC, 7402XP-LC, 7202EP-LC, 7202EP, 7402EP-LC, 7402EP, 7202LXP-LC, 7402XP-LC, 7202EP-LC Flags –, A:\ Mptutil, Coalescing Depth –, Coalescing Timeout –, Figure 3.6 Interrupt Coalescing Values, 1- Change Interrupt Coalescing Values on Port

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.

Advanced User: Adjusting Default Firmware Settings 3-11

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