From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754694AbYDZM41 (ORCPT ); Sat, 26 Apr 2008 08:56:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751358AbYDZM4R (ORCPT ); Sat, 26 Apr 2008 08:56:17 -0400 Received: from fg-out-1718.google.com ([72.14.220.157]:9835 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751075AbYDZM4Q (ORCPT ); Sat, 26 Apr 2008 08:56:16 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject:references:in-reply-to:content-type:content-transfer-encoding; b=FOexPnM9/719ZlRFgVN5lBc3bdx3nUK4FObJj0U8Yk1w+D3aEdPs9tYzO6numHTswQ8idBMoM66W328NN1jZfPLG5Lh00TJQK771qedEexSU8kF5MQ4ZJIBhFw7CG3VdHmL6xsKrUFAvxWAzglpFqnu13ciOpIizo6Z4h0Tvoyg= Message-ID: <48132665.8050202@googlemail.com> Date: Sat, 26 Apr 2008 14:56:05 +0200 From: Gabriel C User-Agent: Thunderbird 2.0.0.12 (X11/20080227) MIME-Version: 1.0 To: Andrew Morton CC: Yinghai Lu , Ingo Molnar , Andi Kleen , "H. Peter Anvin" , LKML , Jesse Barnes , Mika Fischer , balajirrao@gmail.com Subject: Re: [PATCH] x86_32: trim memory by updating e820 v3 References: <200801192045.17291.yinghai.lu@sun.com> <200801202256.48365.yinghai.lu@sun.com> <20080122165125.GA17992@elte.hu> <200801221623.20861.yinghai.lu@sun.com> <20080426035614.a30afb17.akpm@linux-foundation.org> In-Reply-To: <20080426035614.a30afb17.akpm@linux-foundation.org> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andrew Morton wrote: > On Tue, 22 Jan 2008 16:23:20 -0800 Yinghai Lu wrote: > >> [PATCH] x86_32: trim memory by updating e820 v3 >> >> when mtrr is not covering all e820 table, need to trim the ram, need to update e820 >> >> reuse some code for x86_64 >> >> here need to add early_get_cap and use it in early_cpu_detect, and move mtrr_bp_init early >> >> need Justine to test with his special system with bug bios. >> >> Signed-off-by: Yinghai Lu > > Speaking of mtrr and e820.... > > Could someone please take a peek at > http://bugzilla.kernel.org/show_bug.cgi?id=10508 ? > > For some reason we seem to have turned this: > > [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009f800 (usable) > [ 0.000000] BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved) > [ 0.000000] BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved) > [ 0.000000] BIOS-e820: 0000000000100000 - 00000000bf6d0000 (usable) > [ 0.000000] BIOS-e820: 00000000bf6d0000 - 00000000bf6e3000 (ACPI NVS) > [ 0.000000] BIOS-e820: 00000000bf6e3000 - 00000000c0000000 (reserved) > [ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) > [ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) > [ 0.000000] BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved) > [ 0.000000] BIOS-e820: 00000000fed14000 - 00000000fed1a000 (reserved) > [ 0.000000] BIOS-e820: 00000000fed1c000 - 00000000fed90000 (reserved) > [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) > [ 0.000000] BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved) > [ 0.000000] BIOS-e820: 0000000100000000 - 0000000140000000 (usable) > > into this: > > reg00: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1 > reg01: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1 > reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1 > reg03: base=0xbf700000 (3063MB), size= 1MB: uncachable, count=1 > reg04: base=0xbf800000 (3064MB), size= 8MB: uncachable, count=1 > > which screws up the X server's attempt to map the video memory at > 0xd0000000. I see that on my box with ASUS P5E-VM DO and 4G RAM. It has an Q35 intel chipset and the intel card is set to use 256MB in BIOS. I tested 2.6.{24*,25,25-next,25-latest-git} 32/64 bit. Also I get the mtrr type mismatch message on 32 and 64 bit kernels. ... [ 0.000000] BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009ec00 (usable) [ 0.000000] BIOS-e820: 000000000009ec00 - 00000000000a0000 (reserved) [ 0.000000] BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved) [ 0.000000] BIOS-e820: 0000000000100000 - 00000000cf550000 (usable) [ 0.000000] BIOS-e820: 00000000cf550000 - 00000000cf55e000 (ACPI data) [ 0.000000] BIOS-e820: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS) [ 0.000000] BIOS-e820: 00000000cf5e0000 - 00000000cf600000 (reserved) [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) [ 0.000000] BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved) [ 0.000000] BIOS-e820: 0000000100000000 - 000000012c000000 (usable) ... cat /proc/mtrr : reg00: base=0xd0000000 (3328MB), size= 256MB: uncachable, count=1 reg01: base=0xe0000000 (3584MB), size= 512MB: uncachable, count=1 reg02: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1 reg03: base=0x100000000 (4096MB), size= 512MB: write-back, count=1 reg04: base=0x120000000 (4608MB), size= 128MB: write-back, count=1 reg05: base=0x128000000 (4736MB), size= 64MB: write-back, count=1 reg06: base=0xcf600000 (3318MB), size= 2MB: uncachable, count=1 dmesg is saying : .. [ 24.012694] [drm] Initialized i915 1.6.0 20060119 on minor 0 [ 24.175500] mtrr: type mismatch for d0000000,10000000 old: write-back new: write-combining [ 24.423740] set status page addr 0x00033000 .. from Xorg log : ... (WW) intel(0): Failed to set up write-combining range (0xd0000000,0x10000000) (II) intel(0): vgaHWGetIOBase: hwp->IOBase is 0x03d0, hwp->PIOOffset is 0x0000 ... Regards, Gabriel