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Interrupt Moderation — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 167
Figure 20. Interrupt Throttle Flow Diagram
For cases where the 82575 is connected to a small number of clients, it is desirable to initiate the
interrupt as soon as possible with minimum latency. For these cases, when the EITR counter counts
down to zero and no interrupt event has happened, then the EITR counter is not reset but stays at zero.
Therefore, the next interrupt event triggers an immediate interrupt (see Figure 21 and Figure 22).
Yes
No
No
Yes
Start Count
Load Counter
with Interval
Down
Counter = 0
?
Interrupt
Active
?
Assert Interrupt
Counter
Written to
0