From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763539AbZEGW20 (ORCPT ); Thu, 7 May 2009 18:28:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762864AbZEGW1N (ORCPT ); Thu, 7 May 2009 18:27:13 -0400 Received: from mga06.intel.com ([134.134.136.21]:35559 "EHLO orsmga101.jf.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752860AbZEGW1H (ORCPT ); Thu, 7 May 2009 18:27:07 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.40,312,1239001200"; d="scan'208";a="410470417" From: "H. Peter Anvin" To: linux-kernel@vger.kernel.org Cc: vgoyal@redhat.com, hbabu@us.ibm.com, kexec@lists.infradead.org, ying.huang@intel.com, mingo@elte.hu, tglx@linutronix.de, ebiederm@xmission.com, sam@ravnborg.org, "H. Peter Anvin" Subject: [PATCH 03/14] x86, config: change defaults PHYSICAL_START and PHYSICAL_ALIGN Date: Thu, 7 May 2009 15:26:51 -0700 Message-Id: <1241735222-6640-4-git-send-email-hpa@linux.intel.com> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1241735222-6640-1-git-send-email-hpa@linux.intel.com> References: <1241735222-6640-1-git-send-email-hpa@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: H. Peter Anvin Change the default for CONFIG_PHYSICAL_START to 16 MB; 4 MB if EMBEDDED. Change the default for CONFIG_PHYSICAL_ALIGN to match up with a large page alignment datum (4 MB for non-PAE, 2 MB for PAE.) The default of 16 MB is designed to avoid occupying ZONE_DMA, as well as avoiding a 15-16 MB memory hole, which some vendors inexplicably still have in their systems. [ Impact: minor performance improvement, leave ZONE_DMA free ] Signed-off-by: H. Peter Anvin --- arch/x86/Kconfig | 19 +++++++++++-------- 1 files changed, 11 insertions(+), 8 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 039c3f0..13b3a5a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1455,17 +1455,20 @@ config KEXEC_JUMP config PHYSICAL_START hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) - default "0x1000000" if X86_NUMAQ - default "0x200000" if X86_64 - default "0x100000" + default "0x400000" if EMBEDDED + default "0x1000000" ---help--- This gives the physical address where the kernel is loaded. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then bzImage will decompress itself to above physical address and - run from there. Otherwise, bzImage will run from the address where - it has been loaded by the boot loader and will ignore above physical - address. + run from there. Otherwise, bzImage will run from the either + the above physical address or where it has been loaded by + the boot loader, whichever is higher. + + For embedded machines with very small memory (less than + about 24 MB) this may need to be adjusted downward from the + default value of 0x1000000 (16 MB). In normal kdump cases one does not have to set/change this option as now bzImage can be compiled as a completely relocatable image @@ -1516,8 +1519,8 @@ config RELOCATABLE config PHYSICAL_ALIGN hex prompt "Alignment value to which kernel should be aligned" if X86_32 - default "0x100000" if X86_32 - default "0x200000" if X86_64 + default "0x200000" if X86_64 || X86_PAE + default "0x400000" range 0x2000 0x400000 ---help--- This value puts the alignment restrictions on physical address -- 1.6.0.6 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mga06.intel.com ([134.134.136.21] helo=orsmga101.jf.intel.com) by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux)) id 1M2C3d-0008Sn-Ad for kexec@lists.infradead.org; Thu, 07 May 2009 22:27:32 +0000 From: "H. Peter Anvin" Subject: [PATCH 03/14] x86, config: change defaults PHYSICAL_START and PHYSICAL_ALIGN Date: Thu, 7 May 2009 15:26:51 -0700 Message-Id: <1241735222-6640-4-git-send-email-hpa@linux.intel.com> In-Reply-To: <1241735222-6640-1-git-send-email-hpa@linux.intel.com> References: <1241735222-6640-1-git-send-email-hpa@linux.intel.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: linux-kernel@vger.kernel.org Cc: "H. Peter Anvin" , kexec@lists.infradead.org, hbabu@us.ibm.com, ebiederm@xmission.com, ying.huang@intel.com, mingo@elte.hu, sam@ravnborg.org, tglx@linutronix.de, vgoyal@redhat.com From: H. Peter Anvin Change the default for CONFIG_PHYSICAL_START to 16 MB; 4 MB if EMBEDDED. Change the default for CONFIG_PHYSICAL_ALIGN to match up with a large page alignment datum (4 MB for non-PAE, 2 MB for PAE.) The default of 16 MB is designed to avoid occupying ZONE_DMA, as well as avoiding a 15-16 MB memory hole, which some vendors inexplicably still have in their systems. [ Impact: minor performance improvement, leave ZONE_DMA free ] Signed-off-by: H. Peter Anvin --- arch/x86/Kconfig | 19 +++++++++++-------- 1 files changed, 11 insertions(+), 8 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 039c3f0..13b3a5a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1455,17 +1455,20 @@ config KEXEC_JUMP config PHYSICAL_START hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) - default "0x1000000" if X86_NUMAQ - default "0x200000" if X86_64 - default "0x100000" + default "0x400000" if EMBEDDED + default "0x1000000" ---help--- This gives the physical address where the kernel is loaded. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then bzImage will decompress itself to above physical address and - run from there. Otherwise, bzImage will run from the address where - it has been loaded by the boot loader and will ignore above physical - address. + run from there. Otherwise, bzImage will run from the either + the above physical address or where it has been loaded by + the boot loader, whichever is higher. + + For embedded machines with very small memory (less than + about 24 MB) this may need to be adjusted downward from the + default value of 0x1000000 (16 MB). In normal kdump cases one does not have to set/change this option as now bzImage can be compiled as a completely relocatable image @@ -1516,8 +1519,8 @@ config RELOCATABLE config PHYSICAL_ALIGN hex prompt "Alignment value to which kernel should be aligned" if X86_32 - default "0x100000" if X86_32 - default "0x200000" if X86_64 + default "0x200000" if X86_64 || X86_PAE + default "0x400000" range 0x2000 0x400000 ---help--- This value puts the alignment restrictions on physical address -- 1.6.0.6 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec