From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752821Ab0IVDpC (ORCPT ); Tue, 21 Sep 2010 23:45:02 -0400 Received: from out2.smtp.messagingengine.com ([66.111.4.26]:44454 "EHLO out2.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752092Ab0IVDpB (ORCPT ); Tue, 21 Sep 2010 23:45:01 -0400 X-Sasl-enc: +1QoH7woWO9aj9LrVqQ+esz3AiIcUUuxNpmbJ3tcJ7AR 1285127099 Message-ID: From: "Rob Mueller" To: "Christoph Lameter" , "Mel Gorman" Cc: "KOSAKI Motohiro" , , "Bron Gondwana" , "linux-mm" References: <1284349152.15254.1394658481@webmail.messagingengine.com> <20100916184240.3BC9.A69D9226@jp.fujitsu.com> <20100920093440.GD1998@csn.ul.ie> <52C8765522A740A4A5C027E8FDFFDFE3@jem> <20100921090407.GA11439@csn.ul.ie> Subject: Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers Date: Wed, 22 Sep 2010 13:44:51 +1000 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > This could be a screwy hardware issue as pointed out before. Certain > controllers restrict the memory that I/O can be done to also (32 bit > controller only able to do I/O to lower 2G?, controller on a PCI bus that > is local only to a particular node) which would make balancing > the file cache difficult. Ah interesting. Is there an easy way to tell if this is an issue? It's an ARECA RAID controller, this is the lspci -vvv data from it... 03:00.0 RAID bus controller: Areca Technology Corp. Device 1680 Subsystem: Areca Technology Corp. Device 1680 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- Kernel driver in use: arcmsr Rob