Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751023AbWEYPso (ORCPT ); Thu, 25 May 2006 11:48:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751080AbWEYPso (ORCPT ); Thu, 25 May 2006 11:48:44 -0400 Received: from smtp.ustc.edu.cn ([202.38.64.16]:34692 "HELO ustc.edu.cn") by vger.kernel.org with SMTP id S1751023AbWEYPsn (ORCPT ); Thu, 25 May 2006 11:48:43 -0400 Message-ID: <348572120.26227@ustc.edu.cn> X-EYOUMAIL-SMTPAUTH: wfg@mail.ustc.edu.cn Date: Thu, 25 May 2006 23:48:46 +0800 To: linux-kernel@vger.kernel.org Cc: Limin Wang Subject: Re: [PATCH 28/33] readahead: loop case Message-ID: <20060525154846.GA6907@mail.ustc.edu.cn> Mail-Followup-To: Wu Fengguang , linux-kernel@vger.kernel.org, Limin Wang References: <20060524111246.420010595@localhost.localdomain> <20060524111911.032100160@localhost.localdomain> <20060524140135.GA19663@laptop.exavio.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060524140135.GA19663@laptop.exavio.cn> User-Agent: Mutt/1.5.11+cvs20060126 From: wfg Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 743 Lines: 18 On Wed, May 24, 2006 at 10:01:35PM +0800, Limin Wang wrote: > > If the loopback files is bigger than the memory size, it may cause miss again and > may better to turn on the read ahead? > The readahead is always on, it's only disabling lookahead :-) > > Disable look-ahead for loop file. > > > > Loopback files normally contain filesystems, in which case there are already > > proper look-aheads in the upper layer, more look-aheads on the loopback file > > only ruins the read-ahead hit rate. - 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/