I tried the following simple experiment and am not able to understand the results:
Calcualted the number of interrupts generated by the infiniband [with little or no traffic to the NIC] over a period of 10seconds and saw around 10-20 interrupts/sec. Then ran a netperf test and saw around 100+ K interrupts/sec. This screwed up my host machine. To reduce the impact of the interrupts, I add a call back that is scheduled to be periodically called every few microseconds that masks the irq line used by the NIC and a little later unmasks the same. Noticed that with no traffic, I see anywhere between 30-50K interrupts/sec. With the netperf traffic, I see around 120K+ interrupts/sec.
Am a newbie to infiniband technology and so do not understand why so many interrupts are getting generated when I have my call back periodically called. Could it be that the Infiniband supports MSI? Or is what I am seeing IPIs? Or does Infiniband generate interrupts based on types of events and what I am doing by masking/unmasking the interrupt line is one such event?
Any information/suggestions would be useful.
Thanks in advance,
harish
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