From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755509AbaHHG5v (ORCPT ); Fri, 8 Aug 2014 02:57:51 -0400 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:7730 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752547AbaHHG5r (ORCPT ); Fri, 8 Aug 2014 02:57:47 -0400 Date: Fri, 8 Aug 2014 14:55:33 +0800 From: Jisheng Zhang To: Eric Dumazet CC: Dmitry Popov , "davem@davemloft.net" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: Weird NET_RX softirq behavior Message-ID: <20140808145533.5675e695@xhacker> In-Reply-To: <1407476878.3604.0.camel@edumazet-glaptop2.roam.corp.google.com> References: <20140807171050.77819b10@xhacker> <20140807181813.37b73927513266381d55ad0d@qrator.net> <20140808103734.677bff7e@xhacker> <1407476878.3604.0.camel@edumazet-glaptop2.roam.corp.google.com> X-Mailer: Claws Mail 3.10.1 (GTK+ 2.24.24; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.12.52,1.0.27,0.0.0000 definitions=2014-08-08_02:2014-08-06,2014-08-08,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1402240000 definitions=main-1408080082 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 7 Aug 2014 22:47:58 -0700 Eric Dumazet 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.