netdev - Re: Weird NET_RX softirq behavior

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Date:	Fri, 8 Aug 2014 14:55:33 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Dmitry Popov <ixaphire@...tor.net>,
	"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

On Thu, 7 Aug 2014 22:47:58 -0700
Eric Dumazet <eric.dumazet@...il.com> wrote:

> On Fri, 2014-08-08 at 10:37 +0800, Jisheng Zhang wrote:
> > nd 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?
> 
> Multicast loop. Check dev_loopback_xmit() and its callers.
> 
> 

That's it! This make sense

I didn't see any NET_RX on CPU1,2,3 if I disabled mulitcast

Thanks very much.
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