From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934730Ab3E1QBR (ORCPT ); Tue, 28 May 2013 12:01:17 -0400 Received: from mail.candelatech.com ([208.74.158.172]:49053 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934639Ab3E1QBQ (ORCPT ); Tue, 28 May 2013 12:01:16 -0400 Message-ID: <51A4D4AD.2010507@candelatech.com> Date: Tue, 28 May 2013 09:00:45 -0700 From: Ben Greear Organization: Candela Technologies User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 MIME-Version: 1.0 To: Francois Romieu CC: atomlin@redhat.com, netdev@vger.kernel.org, davem@davemloft.net, edumazet@google.com, pshelar@nicira.com, mst@redhat.com, alexander.h.duyck@intel.com, riel@redhat.com, aquini@redhat.com, sergei.shtylyov@cogentembedded.com, linux-kernel@vger.kernel.org Subject: Re: [Patch v2] skbuff: Hide GFP_ATOMIC page allocation failures for dropped packets References: <1369601101-23057-1-git-send-email-atomlin@redhat.com> <20130527224149.GA4384@electric-eye.fr.zoreil.com> In-Reply-To: <20130527224149.GA4384@electric-eye.fr.zoreil.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/27/2013 03:41 PM, Francois Romieu wrote: > atomlin@redhat.com : > [...] >> Failed GFP_ATOMIC allocations by the network stack result in dropped >> packets, which will be received on a subsequent retransmit, and an >> unnecessary, noisy warning with a kernel backtrace. >> >> These warnings are harmless, but they still cause users to panic and >> file bug reports over dropped packets. It would be better to hide the >> failed allocation warnings and backtraces, and let retransmits handle >> dropped packets quietly. > > Linux VM may be perfect but device drivers do stupid things. > > Please don't paper over it just because some shit ends in your backyard. We should rate-limit these messages at least. When a system is low on memory the logs can quickly fill up with useless OOM messages, further slowing the system... Ben > -- Ben Greear Candela Technologies Inc http://www.candelatech.com