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On latency in event processing network
08-05-2008
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sys_attrs_fta(5) File Formats Manual sys_attrs_fta(5) NAME
sys_attrs_fta - fta subsystem attributes DESCRIPTION
The fta (fta) kernel subsystem is used by the Fiber Distributed Data Interface (FDDI) adapters. Refer to the sys_attrs(5) reference page for an introduction to the topic of kernel subsystem attributes. A value that enables (1) or disables (0) the awakening of a separate thread to handle interrupt service work. The processing of received frames or of completed transmits is typically performed by the driver's interrupt service routine. If minimal_isr is enabled, the interrupt service routine does not do the processing. Instead, it awakens another thread to do the pro- cessing. The benefit is that the new thread can run on any other processor, thereby freeing the master processor for other inter- rupt processing and other tasks. While this may improve overall system performance, there will be an increased latency in the pro- cessing of received FDDI frames. If minimal_isr is disabled, the interrupt service routine processes all received frames and completed transmits. This can delay the master processor from servicing other I/O interrupts and can lead to overall system performance degradation. However, the latency for handling received FDDI frames will be very low. Default value: 1 (enabled) SEE ALSO
sys_attrs(5) sys_attrs_fta(5)