Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756251Ab2JDRRg (ORCPT ); Thu, 4 Oct 2012 13:17:36 -0400 Received: from mail-bk0-f46.google.com ([209.85.214.46]:52510 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755680Ab2JDRRf (ORCPT ); Thu, 4 Oct 2012 13:17:35 -0400 Subject: Re: kernel 3.2.27 on arm: WARNING: at mm/page_alloc.c:2109 __alloc_pages_nodemask+0x1d4/0x68c() From: Eric Dumazet To: mbizon@freebox.fr Cc: David Madore , Francois Romieu , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Hugh Dickins In-Reply-To: <1349370573.2532.25.camel@sakura.staff.proxad.net> References: <20120829002548.GA7063@aldebaran.gro-tsen.net> <1349366521.2532.12.camel@sakura.staff.proxad.net> <1349369406.16011.82.camel@edumazet-glaptop> <1349370573.2532.25.camel@sakura.staff.proxad.net> Content-Type: text/plain; charset="UTF-8" Date: Thu, 04 Oct 2012 19:17:29 +0200 Message-ID: <1349371049.16011.90.camel@edumazet-glaptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 695 Lines: 19 On Thu, 2012-10-04 at 19:09 +0200, Maxime Bizon wrote: > yes, on ipv6 forward path the default NET_SKB_PAD is too small, so each > packet forwarded has its headroom expanded, it is then recycled and gets > its original default headroom back, then it gets forwarded, > expanded, ... Hmm, this sounds bad (especially without recycle) Might I assume NET_SKB_PAD is 32 on this arch ? We might adjust NET_SKB_PAD to avoid all these memory copies... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/