Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933745AbcKWUDd (ORCPT ); Wed, 23 Nov 2016 15:03:33 -0500 Received: from mail-io0-f173.google.com ([209.85.223.173]:33970 "EHLO mail-io0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750945AbcKWUDc (ORCPT ); Wed, 23 Nov 2016 15:03:32 -0500 MIME-Version: 1.0 In-Reply-To: <20161123182115.GA28733@e106950-lin.cambridge.arm.com> References: <20161116180156.GA21156@e106950-lin.cambridge.arm.com> <20161116210139.GB21156@e106950-lin.cambridge.arm.com> <20161117164200.GA24653@e106950-lin.cambridge.arm.com> <20161122103351.GA25080@e106950-lin.cambridge.arm.com> <20161122152733.GH25080@e106950-lin.cambridge.arm.com> <20161123182115.GA28733@e106950-lin.cambridge.arm.com> From: Eric Dumazet Date: Wed, 23 Nov 2016 12:03:28 -0800 Message-ID: Subject: Re: Regression: Failed boots bisected to 4cd13c21b207 "softirq: Let ksoftirqd do its job" To: Brian Starkey Cc: Thomas Gleixner , LKML , Peter Zijlstra , Ingo Molnar , Andrew Morton , Alexander Potapenko , Steven Rostedt , Sebastian Andrzej Siewior Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 835 Lines: 30 On Wed, Nov 23, 2016 at 10:21 AM, Brian Starkey wrote: > This patch didn't help. > > I did get some new traces though - I've attached the diff for the > trace_printks I added. > > Before 4cd13c21b207: > https://drive.google.com/open?id=0B8siaK6ZjvEwcEtOeFQzTmY0Nnc > After 4cd13c21b207: > https://drive.google.com/open?id=0B8siaK6ZjvEwZnQ4MVg1d3d1Tm8 > > It looks like the difference is that after 4cd13c21b207 the RX softirq > isn't running, and RX interrupts don't call softirq_raise anymore - > presumably because there's one pending, but I didn't have time to > track that down to a code-path. > > Cheers, > -Brian > Hi Brian Looks like netif_rx() drops the incoming packets then ? Maybe netif_running() is not happy :( Could you trace netif_rx() return value (NET_RX_SUCCESS or NET_RX_DROP) Thanks !