From: "H. Peter Anvin" <hpa@linux.intel.com> 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" <hpa@zytor.com> Subject: [PATCH 03/14] x86, config: change defaults PHYSICAL_START and PHYSICAL_ALIGN Date: Thu, 7 May 2009 15:26:51 -0700 [thread overview] Message-ID: <1241735222-6640-4-git-send-email-hpa@linux.intel.com> (raw) In-Reply-To: <1241735222-6640-1-git-send-email-hpa@linux.intel.com> From: H. Peter Anvin <hpa@zytor.com> 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 <hpa@zytor.com> --- 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
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@linux.intel.com> To: linux-kernel@vger.kernel.org Cc: "H. Peter Anvin" <hpa@zytor.com>, 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 Subject: [PATCH 03/14] x86, config: change defaults PHYSICAL_START and PHYSICAL_ALIGN Date: Thu, 7 May 2009 15:26:51 -0700 [thread overview] Message-ID: <1241735222-6640-4-git-send-email-hpa@linux.intel.com> (raw) In-Reply-To: <1241735222-6640-1-git-send-email-hpa@linux.intel.com> From: H. Peter Anvin <hpa@zytor.com> 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 <hpa@zytor.com> --- 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
next prev parent reply other threads:[~2009-05-07 22:28 UTC|newest] Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top 2009-05-07 22:26 [PATCH 00/14] RFC: x86: relocatable kernel changes H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-07 22:26 ` [PATCH 01/14] x86, boot: align the .bss section in the decompressor H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-08 7:17 ` Sam Ravnborg 2009-05-08 7:17 ` Sam Ravnborg 2009-05-08 8:18 ` Eric Dumazet 2009-05-08 8:18 ` Eric Dumazet 2009-05-08 16:54 ` H. Peter Anvin 2009-05-08 16:54 ` H. Peter Anvin 2009-05-08 7:53 ` Cyrill Gorcunov 2009-05-08 7:53 ` Cyrill Gorcunov 2009-05-08 17:03 ` H. Peter Anvin 2009-05-08 17:03 ` H. Peter Anvin 2009-05-08 17:15 ` Cyrill Gorcunov 2009-05-08 17:15 ` Cyrill Gorcunov 2009-05-08 17:21 ` H. Peter Anvin 2009-05-08 17:21 ` H. Peter Anvin 2009-05-07 22:26 ` [PATCH 02/14] x86, boot: honor CONFIG_PHYSICAL_START when relocatable H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-08 7:34 ` Sam Ravnborg 2009-05-08 7:34 ` Sam Ravnborg 2009-05-08 16:58 ` H. Peter Anvin 2009-05-08 16:58 ` H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin [this message] 2009-05-07 22:26 ` [PATCH 03/14] x86, config: change defaults PHYSICAL_START and PHYSICAL_ALIGN H. Peter Anvin 2009-05-08 7:36 ` Sam Ravnborg 2009-05-08 7:36 ` Sam Ravnborg 2009-05-08 9:47 ` Ingo Molnar 2009-05-08 9:47 ` Ingo Molnar 2009-05-08 17:01 ` H. Peter Anvin 2009-05-08 17:01 ` H. Peter Anvin 2009-05-07 22:26 ` [PATCH 04/14] x86, boot: unify use LOAD_PHYSICAL_ADDR and LOAD_PHYSICAL_ALIGN H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-07 22:26 ` [PATCH 05/14] kbuild: allow compressors (gzip, bzip2, lzma) to take multiple inputs H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-08 7:42 ` Sam Ravnborg 2009-05-08 7:42 ` Sam Ravnborg 2009-05-08 20:18 ` H. Peter Anvin 2009-05-08 20:18 ` H. Peter Anvin 2009-05-08 20:47 ` Sam Ravnborg 2009-05-08 20:47 ` Sam Ravnborg 2009-05-08 20:49 ` H. Peter Anvin 2009-05-08 20:49 ` H. Peter Anvin 2009-05-08 21:33 ` Sam Ravnborg 2009-05-08 21:33 ` Sam Ravnborg 2009-05-07 22:26 ` [PATCH 06/14] x86: add a Kconfig symbol for when relocations are needed H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-07 22:26 ` [PATCH 07/14] x86, boot: simplify arch/x86/boot/compressed/Makefile H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-08 7:45 ` Sam Ravnborg 2009-05-08 7:45 ` Sam Ravnborg 2009-05-07 22:26 ` [PATCH 08/14] x86, boot: use BP_scratch in arch/x86/boot/compressed/head_*.S H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-07 22:26 ` [PATCH 09/14] x86, boot: add new runtime_address and runtime_size bzImage fields H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-08 7:55 ` Sam Ravnborg 2009-05-08 7:55 ` Sam Ravnborg 2009-05-08 21:09 ` H. Peter Anvin 2009-05-08 21:09 ` H. Peter Anvin 2009-05-08 21:35 ` Sam Ravnborg 2009-05-08 21:35 ` Sam Ravnborg 2009-05-07 22:26 ` [PATCH 10/14] x86, doc: document the runtime_start " H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-07 22:26 ` [PATCH 11/14] x86, boot: use rep movsq to move kernel on 64 bits H. Peter Anvin 2009-05-07 22:26 ` H. Peter Anvin 2009-05-07 22:27 ` [PATCH 12/14] x86, boot: zero EFLAGS on 32 bits H. Peter Anvin 2009-05-07 22:27 ` H. Peter Anvin 2009-05-07 22:27 ` [PATCH 13/14] x86: make CONFIG_RELOCATABLE the default H. Peter Anvin 2009-05-07 22:27 ` H. Peter Anvin 2009-05-07 22:27 ` [PATCH 14/14] x86, defconfig: update defconfigs to relocatable H. Peter Anvin 2009-05-07 22:27 ` H. Peter Anvin 2009-05-08 1:23 ` [PATCH 00/14] RFC: x86: relocatable kernel changes Eric W. Biederman 2009-05-08 1:23 ` Eric W. Biederman 2009-05-08 5:31 ` H. Peter Anvin 2009-05-08 5:31 ` H. Peter Anvin 2009-05-08 6:54 ` Eric W. Biederman 2009-05-08 6:54 ` Eric W. Biederman 2009-05-08 18:04 ` H. Peter Anvin 2009-05-08 18:04 ` H. Peter Anvin 2009-05-08 18:47 ` H. Peter Anvin 2009-05-08 18:47 ` H. Peter Anvin 2009-05-11 5:18 ` RFC: x86: relocatable kernel changes (revised spec) H. Peter Anvin 2009-05-11 5:18 ` H. Peter Anvin 2009-05-11 11:54 ` Eric W. Biederman 2009-05-11 11:54 ` Eric W. Biederman 2009-05-11 16:03 ` H. Peter Anvin 2009-05-11 16:03 ` H. Peter Anvin 2009-05-11 17:56 ` RFC: x86: relocatable kernel changes (revised spec v2) H. Peter Anvin 2009-05-11 17:56 ` H. Peter Anvin
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