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How to test NAPI function on Linux?

I am trying to test the functionality of NAPI in an embedded Linux environment. I used pktgen to generate a large number of packets and tried to check the number of interruptions of my network interface in / proc / interrupts.

I found out that the number of interrupts is comparatively less than the generated packets. I am also trying to set netdev_budget 'from 1 to 1000 (300 by default), so that I can observe a decrease in the number of interrupts as netdev_budget increases.

However, increasing netdev_budget doesn't seem to help. The interrupt is similar to the interrupt observed with netdev_budget set to 300.

So here are my queries:

  • What is the effect of "netdev_budget" on NAPI?

  • What other parameters can / should I configure to monitor changes in the number of interrupts?

  • Is there any other way that I can use to test NAPI functionality on Linux? (In addition to directly viewing the network driver code)

Any help is a lot.

Thanks in advance.

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I wrote a comprehensive Linux network setup blog post that explains everything about monitoring, tuning and optimizing the Linux network stack (including NAPI weight). Take a look.

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