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Improving Performance

This chapter describes a few things you can do to enhance the performance of your custom HBA device driver in Mac OS X. You should read this chapter if your hardware has any of the following features:

• Serialization requirements for accessing registers

• An optimum I/O transaction size or a maximum number of tasks it can handle

• Support for interrupt coalescing

• A shared interrupt line

Contents:

Minimize Hardware-Access Synchronization
Report Appropriate Transaction Size
Report Appropriate Maximum Task Count
Turn Off Interrupt Coalescing
Handle Shared Interrupts

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