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Symptom(s):
High CPU utilization when multiple connections are loaded using the Linux* driver.
Cause:
The CPU utilization can be lowered by tweaking the Interrupt Throttle Register (ITR), best result with ITR =3000.
However this results in throughput loss when fewer ports are active.
Solution:
When e1000 is loaded with default settings and multiple adapters are in use simultaneously, the CPU utilization may increase non-linearly. In order to limit the CPU utilization without impacting the overall throughput, it is recommended to load the driver as follows:
insmod e1000.o InterruptThrottleRate=3000,3000,3000.
This sets the InterrupThrottleRate to 3000 interrupts/sec for the first, second and third instances of the driver. The actual value depends on the platform used.
Operating System:
This applies to:
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