On latency in event processing network


 
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Old 08-05-2008
On latency in event processing network

2008-08-05T09:13:00.005+03:00
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Packing, on my way to a family vacation in Anatalya, Turkey.

Following an interesting discussion yesterday about performance metrics -- it turns out that definition of latency in event processing network is quite tricky. The reason is that an event can move in multiple paths over the network, in some it is filterred out, in some it just getting into internal state of agent since it does not complete a pattern, and in some it may complete a pattern and trigger reaction, thus there are various ways to define the metrics here. This is important since optimization has to take into account the goal function - what is being optimized. More discussion on this area -- after I'll return. I'll be out of touch for a week.

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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)