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Date: Fri, 8 Aug 2014 10:37:34 +0800
From: Jisheng Zhang <jszhang@...vell.com>
To: Dmitry Popov <ixaphire@...tor.net>
CC: "davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Weird NET_RX softirq behavior
Hi Dmitry,
On Thu, 7 Aug 2014 07:18:13 -0700
Dmitry Popov <ixaphire@...tor.net> wrote:
> On Thu, 7 Aug 2014 17:10:50 +0800
> Jisheng Zhang <jszhang@...vell.com> wrote:
>
> > 2. only one netdev in the system: eth0.
>
> There should also be lo (loopback) at least.
Yep, I forget that ;)
>
> > 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.
Yes. lo only send and recive 7 packets so far, about 1400bytes. Seems small
comparing with the CPU1 and CPU2 NET_RX softirq numbers, right?
Any other possible case?
Thanks for your reply,
Jisheng
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