Installation manual
74
Boot Driver
Choices: enabled, scan only, disabled
Default: disabled
If enabled and disk drives or a bootable CD are detected during
the bus scan, the BIOS driver remains resident. If disabled, the
BIOS starts, resets the adapter chip and unloads the driver.
If
Scan Only
selected, the BIOS driver scans the bus and
displays the devices attached, then unloads itself after a brief
delay.
I/O Address
Displays the PCI slot in which this storage controller is installed.
IRQ:
Displays the interrupt level assigned by the BIOS to the adapter.
Interrupt Coalescing
Choices: None, Low, Medium, High
Default: Low
Specifies the time period an adapter chip delays an interrupt.
This allows the adapter chip to queue up more than one
interrupt before interrupting the CPU. When this methodology is
chosen there is less overhead to service the interrupts.
However, the coalescing time may delay the delivery of the
completion for a single interrupt.
PCI Latency Timer
Choices: 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160,
192, 224, 248
Default: see below
Specifies how long the storage controller maintains control of
the PCI bus. Larger values allow the adapter to remain on the
bus longer, improving performance, especially for large files.
However, controlling the PCI bus for too long can starve I/O to
other devices, adversely affecting their performance.
As a default, the computer system firmware/BIOS automatically
sets this value. However, adjusting the value for the ATTO
adapter overrides the system default, allowing you to achieve
specific performance results.
Note
Set the Latency timer to 32 for Media 100
Finish
PCI Memory Write/Invalidate
Choices: Default, Disabled
Default: Default
Setting to disabled overrides the host’s BIOS setting.