From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266481AbUHCONo (ORCPT ); Tue, 3 Aug 2004 10:13:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266324AbUHCONo (ORCPT ); Tue, 3 Aug 2004 10:13:44 -0400 Received: from mail.gmx.net ([213.165.64.20]:25568 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S266481AbUHCONj (ORCPT ); Tue, 3 Aug 2004 10:13:39 -0400 X-Authenticated: #4512188 Message-ID: <410F9D94.8050302@gmx.de> Date: Tue, 03 Aug 2004 16:13:40 +0200 From: "Prakash K. Cheemplavam" User-Agent: Mozilla Thunderbird 0.7.1 (X11/20040710) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Jens Axboe CC: "Barry K. Nathan" , Steve Snyder , Linux Kernel Mailing List Subject: Re: HIGHMEM4G config for 1GB RAM on desktop? References: <200408021602.34320.swsnyder@insightbb.com> <20040802220521.GA2179@ip68-4-98-123.oc.oc.cox.net> <20040803133034.GM23504@suse.de> In-Reply-To: <20040803133034.GM23504@suse.de> X-Enigmail-Version: 0.84.2.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Jens Axboe wrote: | On Mon, Aug 02 2004, Barry K. Nathan wrote: | |>On Mon, Aug 02, 2004 at 04:02:34PM -0500, Steve Snyder wrote: |> |>>There seems to be a controversy about the use of the CONFIG_HIGHMEM4G |>>kernel configuration. After reading many posts on the subject, I still |>>don't know which setting is best for me. |> |>On my own desktop system with 1GB RAM, any highmem slowdown seems to be |>outweighed by the fact that more disk data stays cached in RAM (so I hit |>the disk much less often). | | | There's also the option of moving the mapping only slightly, so that all | of the 1G fits in low memory. That's the best option for 1G desktop | machines, imho. Changing PAGE_OFFSET from 0xc0000000 to 0xb0000000 would | probably be enough. | | Then you can have your cake and eat it too. This works nicely for me. I wonder why this doesn't become standard behaviour in kernel. At least a lot of people would be happy about it. Prakash -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFBD52UxU2n/+9+t5gRArjwAKDhLKcV2C42O++Eqd7yFOQoURtoxgCgyt/m 5dDyjJtoF7WDzelrGzk7MGM= =fdFY -----END PGP SIGNATURE-----