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From: Dmitry Popov <ixaphire@qrator.net>
To: Jisheng Zhang <jszhang@marvell.com>
Cc: <davem@davemloft.net>, <netdev@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
Subject: Re: Weird NET_RX softirq behavior
Date: Thu, 7 Aug 2014 18:18:13 +0400	[thread overview]
Message-ID: <20140807181813.37b73927513266381d55ad0d@qrator.net> (raw)
In-Reply-To: <20140807171050.77819b10@xhacker>

On Thu, 7 Aug 2014 17:10:50 +0800
Jisheng Zhang <jszhang@marvell.com> 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.

  reply	other threads:[~2014-08-07 14:18 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-07  9:10 Weird NET_RX softirq behavior Jisheng Zhang
2014-08-07 14:18 ` Dmitry Popov [this message]
2014-08-08  2:37   ` Jisheng Zhang
2014-08-08  5:47     ` Eric Dumazet
2014-08-08  6:55       ` Jisheng Zhang

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