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Date:	Thu, 7 Aug 2014 18:18:13 +0400
From:	Dmitry Popov <>
To:	Jisheng Zhang <>
Cc:	<>, <>,
Subject: Re: Weird NET_RX softirq behavior

On Thu, 7 Aug 2014 17:10:50 +0800
Jisheng Zhang <> wrote:

> 2. only one netdev in the system: eth0.

There should also be lo (loopback) at least.

> 4. But NET_RX seems abnormal
> ~ # cat /proc/softirqs 
>                     CPU0       CPU1       CPU2       CPU3       
>       NET_RX:     445587        322        983          0
> I'm expecting NET_RX under CPU1, 2, 3 should be zero. Any suggestions
> about this abnormal behavior?

Do you have any loopback traffic? It could be handled by CPU1/2 explaining
non-zero NET_RX counters.
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