[openib-general] Question about interrupt generation

[harish]

Hi,
One more question. What kind of event mask helps mask the interrupts?
thanks
harish

On 9/5/06, harish <mvharish at gmail.com> wrote:
>
> Hi All,
>
> 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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