From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933314AbZHVTE2 (ORCPT ); Sat, 22 Aug 2009 15:04:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933225AbZHVTE2 (ORCPT ); Sat, 22 Aug 2009 15:04:28 -0400 Received: from mail-yx0-f175.google.com ([209.85.210.175]:44812 "EHLO mail-yx0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933199AbZHVTE1 convert rfc822-to-8bit (ORCPT ); Sat, 22 Aug 2009 15:04:27 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=SYaXqR/Sil2bOHaJ2aLFiA8W1dmx8xcrN5Cm+ZzQk0MCwO8dseRI9suseyEXfTgjNB qWrvH7bQTmbX/+o7OGlYRsVQqrmIlYkPqym/5+wjd92QR3dzZ6I130/b1fCLHy4lfZXj RxsvYm0jGaDRn0rw9cWW0JVat9jPj8ZDdTRPI= MIME-Version: 1.0 In-Reply-To: <200908222054.59646.volkerarmin@googlemail.com> References: <200908211814.56800.volkerarmin@googlemail.com> <86802c440908221148q2aee29e0i3fe966c60fced3db@mail.gmail.com> <200908222054.59646.volkerarmin@googlemail.com> Date: Sat, 22 Aug 2009 12:04:28 -0700 Message-ID: <86802c440908221204n1afec9dbg98883b0183d8da8b@mail.gmail.com> Subject: Re: amd64 + mtrr: only 3.1gb of 8gb are covered, kernel 2.6.30 and earlier. From: Yinghai Lu To: Volker Armin Hemmann Cc: linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Aug 22, 2009 at 11:54 AM, Volker Armin Hemmann wrote: > On Samstag 22 August 2009, Yinghai Lu wrote: >> On Fri, Aug 21, 2009 at 9:14 AM, Volker Armin >> >> Hemmann wrote: >> > Hi, >> > >> > I have an amd64 system with 8GB ram. Of these only 3.1GB are currently >> > covered with mtrr: >> > cat /proc/mtrr >> > reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back >> > reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back >> > reg02: base=0x0c0000000 ( 3072MB), size=  128MB, count=1: write-back >> > >> > This is with a Phenom II X4. Mobo is an Asrock A770Crossfire with AMD 770 >> > chipset. Ram is 1066 ddr2 running at 800. >> > >> > Before that I had a X2 6000 where I had one more mtrr, covering >> > additional 256mb with 6gb ram total. >> > >> > When I use the opensource driver, I get a 'mtrr disabled' message when X >> > starts, nothing like that with fglrx. The results are the same. >> > >> > Is there anything that I can do about it? I already played with mtrr >> > cleanup options - without any results. >> > >> > Except for reiser4 the kernel is 'vanilla', config is attached, dmesg and >> > lspci are folloiwing: >> > >> > dmesg: >> > [    0.000000] Linux version 2.6.30.5r4 (root@energy) (gcc version 4.4.1 >> > (Gentoo 4.4.1 p1.0) ) #1 SMP Tue Aug 18 06:28:18 CEST 2009 >> > [    0.000000] Command line: root=/dev/md1 >> > md=3,/dev/sda3,/dev/sdb3,/dev/sdc3 nmi_watchdog=0 mtrr_spare_reg_nr=1 >> > [    0.000000] KERNEL supported cpus: >> > [    0.000000]   Intel GenuineIntel >> > [    0.000000]   AMD AuthenticAMD >> > [    0.000000] BIOS-provided physical RAM map: >> > [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) >> > [    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) >> > [    0.000000]  BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved) >> > [    0.000000]  BIOS-e820: 0000000000100000 - 00000000c7eb0000 (usable) >> > [    0.000000]  BIOS-e820: 00000000c7eb0000 - 00000000c7ec0000 (ACPI >> > data) [    0.000000]  BIOS-e820: 00000000c7ec0000 - 00000000c7ef0000 >> > (ACPI NVS) [    0.000000]  BIOS-e820: 00000000c7ef0000 - 00000000c7f00000 >> > (reserved) [    0.000000]  BIOS-e820: 00000000fff00000 - 0000000100000000 >> > (reserved) [    0.000000]  BIOS-e820: 0000000100000000 - 0000000238000000 >> > (usable) [    0.000000] DMI present. >> > [    0.000000] AMI BIOS detected: BIOS may corrupt low RAM, working >> > around it. [    0.000000] e820 update range: 0000000000000000 - >> > 0000000000010000 (usable) ==> (reserved) >> > [    0.000000] last_pfn = 0x238000 max_arch_pfn = 0x100000000 >> > [    0.000000] MTRR default type: uncachable >> > [    0.000000] MTRR fixed ranges enabled: >> > [    0.000000]   00000-9FFFF write-back >> > [    0.000000]   A0000-EFFFF uncachable >> > [    0.000000]   F0000-FFFFF write-protect >> > [    0.000000] MTRR variable ranges enabled: >> > [    0.000000]   0 base 000000000000 mask FFFF80000000 write-back >> > [    0.000000]   1 base 000080000000 mask FFFFC0000000 write-back >> > [    0.000000]   2 base 0000C0000000 mask FFFFF8000000 write-back >> > [    0.000000]   3 disabled >> > [    0.000000]   4 disabled >> > [    0.000000]   5 disabled >> > [    0.000000]   6 disabled >> > [    0.000000]   7 disabled >> > [    0.000000] TOM2: 0000000238000000 aka 9088M >> > [    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new >> > 0x7010600070106 >> > [    0.000000] e820 update range: 00000000c8000000 - 0000000100000000 >> > (usable) ==> (reserved) >> >> ... >> >> > 02:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3870 >> > (prog- if 00 [VGA controller]) >> >        Subsystem: Info-Tek Corp. Device 4070 >> >        Flags: bus master, fast devsel, latency 0, IRQ 30 >> >        Memory at d0000000 (64-bit, prefetchable) [size=256M] >> >        Memory at fdff0000 (64-bit, non-prefetchable) [size=64K] >> >        I/O ports at b000 [size=256] >> >        Expansion ROM at fdfc0000 [disabled] [size=128K] >> >        Capabilities: [50] Power Management version 3 >> >        Capabilities: [58] Express Legacy Endpoint, MSI 00 >> >        Capabilities: [a0] MSI: Mask- 64bit+ Count=1/1 Enable+ >> >        Capabilities: [100] Vendor Specific Information >> >        Kernel driver in use: fglrx_pci >> >        Kernel modules: fglrx >> >> after your start X server, how about cat /proc/mtrr? >> >> thought there should be one WC entry about 256M... for graphics card. >> >> YH > > running X: > > cat /proc/mtrr > reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back > reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back > reg02: base=0x0c0000000 ( 3072MB), size=  128MB, count=1: write-back > > back with my X2 6000 and 4 and 6gb ram, I indeed got another mtrr with 256mb. > But with the phenom and 8gb I don't get it. Neither with fglrx nor with xorg's > radeon driver. Radeon posts a message to dmesg about disabled mtrr. > you should have reg03: base=0x0d0000000 ( 3200MB), size= 256MB, count=1: write-combining do you notice any performance degrade without that entry? YH