Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261906AbVEPVfa (ORCPT ); Mon, 16 May 2005 17:35:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261904AbVEPVeZ (ORCPT ); Mon, 16 May 2005 17:34:25 -0400 Received: from 41-052.adsl.zetnet.co.uk ([194.247.41.52]:26636 "EHLO mail.esperi.org.uk") by vger.kernel.org with ESMTP id S261896AbVEPVeK (ORCPT ); Mon, 16 May 2005 17:34:10 -0400 To: Eric Dumazet Cc: linux-kernel@vger.kernel.org Subject: Re: How to use memory over 4GB References: <6.2.1.2.2.20050516142516.0313e860@mail.tekno-soft.it> <428898CF.5060908@cosmosbay.com> <6.2.1.2.2.20050516151659.077cceb0@mail.tekno-soft.it> <4288AB6A.3060106@cosmosbay.com> <6.2.1.2.2.20050516164236.05922a30@mail.tekno-soft.it> From: Nix X-Emacs: anything free is worth what you paid for it. Date: Mon, 16 May 2005 22:34:00 +0100 In-Reply-To: <6.2.1.2.2.20050516164236.05922a30@mail.tekno-soft.it> (Roberto Fichera's message of "16 May 2005 15:54:37 +0100") Message-ID: <87hdh2am9j.fsf@amaterasu.srvr.nix> User-Agent: Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.4 (Corporate Culture, linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 822 Lines: 18 On 16 May 2005, Roberto Fichera whispered secretively: > At 16.17 16/05/2005, Eric Dumazet wrote: >>If your process is cpu bounded (and not issuing too many system calls), >> then 4GB/4GB split let it address more ram, reducing the need to shift windows in >>mmaped files for example. > > ... any source code that explain better what you say ;-)! perhaps? (In a nutshell: it gives processes an extra 1Gb of virtual memory, at the cost of making system calls --- and everything else that must transition to kernel space --- *much* slower.) - 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/