Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755557AbYLEEJS (ORCPT ); Thu, 4 Dec 2008 23:09:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750953AbYLEEI6 (ORCPT ); Thu, 4 Dec 2008 23:08:58 -0500 Received: from main.gmane.org ([80.91.229.2]:38961 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750948AbYLEEI5 (ORCPT ); Thu, 4 Dec 2008 23:08:57 -0500 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Robert Hancock Subject: Re: Page alloc failures under network/disk IO load Date: Thu, 04 Dec 2008 22:08:43 -0600 Message-ID: <4938A94B.3080801@shaw.ca> References: <20081203222750.391e8890@tuna> <1228378983.5092.7.camel@twins> <1228380128.5092.15.camel@twins> <20081204135443.7c24234a@rockhopper.limebrokerage.com> <20081204224021.GA323@electric-eye.fr.zoreil.com> <4938631F.7010004@isomerica.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Complaints-To: usenet@ger.gmane.org Cc: Francois Romieu , Peter Zijlstra X-Gmane-NNTP-Posting-Host: s0106000c41bb86e1.ss.shawcable.net User-Agent: Thunderbird 2.0.0.18 (Windows/20081105) In-Reply-To: <4938631F.7010004@isomerica.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1407 Lines: 26 Dan Noé wrote: > Francois Romieu wrote: >> Dan Noé : >> [...] >>> I'm a bit confused because on another system (2.6.26.3) I never see >>> messages like this despite having the same amount of physical RAM in >>> each. The 2.6.26.3 system is also under more active use, and has more >>> userspace memory usage. On that system: >> Does this system use the same network card ? > > Nope, good point :) The system experiencing the allocation failures is > using an rtl8169 gigabit NIC (at 1gbps), the 2.6.26.3 system is on a > 100M connection with a gigabit Broadcom BCM5721 / tg3. > > 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. > RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01) > > 04:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 > Gigabit Ethernet PCI Express (rev 11) > > I can see how this could account for different behavior, although > presumably both drivers are calling __netdev_alloc_skb. The Realtek driver is doing an order 1 allocation (an 8KB chunk). That is more likely to fail than an order 0. Are you using jumbo frames or higher than 1500 byte MTU on the network? -- 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/