From: "H. Peter Anvin" <hpa@zytor.com>
To: Dave Jones <davej@redhat.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
vgoyal@in.ibm.com, fastboot@osdl.org,
linux-kernel@vger.kernel.org, Horms <horms@verge.net.au>,
Jan Kratochvil <lace@jankratochvil.net>,
"H. Peter Anvin" <hpa@zytor.com>,
Magnus Damm <magnus.damm@gmail.com>,
Linda Wang <lwang@redhat.com>
Subject: Re: [RFC] ELF Relocatable x86 and x86_64 bzImages
Date: Fri, 04 Aug 2006 16:47:10 -0700 [thread overview]
Message-ID: <44D3DC7E.70100@zytor.com> (raw)
In-Reply-To: <20060804233815.GG18792@redhat.com>
Dave Jones wrote:
> On Fri, Aug 04, 2006 at 05:14:37PM -0600, Eric W. Biederman wrote:
>
> > I guess the practical question is do people see a real performance benefit
> > when loading the kernel at 4MB?
>
> Linus claimed lmbench saw some huge wins. Others showed that for eg,
> a kernel compile took the same amount of time, so take from that what you will..
>
> > Possibly the right solution is to do like I did on x86_64 and simply remove
> > CONFIG_PHYSICAL_START, and always place the kernel at 4MB, or something like
> > that.
> >
> > The practical question is what to do to keep the complexity from spinning
> > out of control. Removing CONFIG_PHYSICAL_START would seriously help with
> > that.
>
> Given the two primary uses of that option right now are a) the aforementioned
> perf win and b) building kexec kernels, I doubt anyone would miss it once
> we go relocatable ;-)
>
We DO want the performance gain with a conventional bootloader. The
perf win is about the location of the uncompressed kernel, not the
compressed kernel.
-hpa
next prev parent reply other threads:[~2006-08-04 23:47 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-01 10:58 [RFC] ELF Relocatable x86 and x86_64 bzImages Eric W. Biederman
2006-08-01 11:03 ` [PATCH 1/33] i386: vmlinux.lds.S Distinguish absolute symbols Eric W. Biederman
2006-08-01 19:06 ` Sam Ravnborg
2006-08-01 11:03 ` [PATCH 2/33] i386: define __pa_symbol Eric W. Biederman
2006-08-01 19:06 ` Andi Kleen
2006-08-02 2:19 ` Eric W. Biederman
2006-08-02 3:04 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 3/33] i386 setup.c: Reserve kernel memory starting from _text Eric W. Biederman
2006-08-01 11:03 ` [PATCH 4/33] i386: CONFIG_PHYSICAL_START cleanup Eric W. Biederman
2006-08-01 19:08 ` Sam Ravnborg
2006-08-02 2:23 ` Eric W. Biederman
2006-08-02 16:14 ` Eric W. Biederman
2006-08-03 14:05 ` Sam Ravnborg
2006-08-01 11:03 ` [PATCH 5/33] i386 Kconfig: Add a range definition to config PHYSICAL_START Eric W. Biederman
2006-08-01 11:03 ` [PATCH 6/33] Make linux/elf.h safe to be included in assembly files Eric W. Biederman
2006-08-01 11:03 ` [PATCH 7/33] elf: Add ELFOSABI_STANDALONE to elf.h Eric W. Biederman
2006-08-01 11:03 ` [PATCH 8/33] kallsyms.c: Generate relocatable symbols Eric W. Biederman
2006-08-01 11:36 ` Paulo Marques
2006-08-01 11:52 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 9/33] i386 boot: Add serial output support to the decompressor Eric W. Biederman
2006-08-01 19:19 ` Andi Kleen
2006-08-02 2:30 ` Eric W. Biederman
2006-08-02 3:07 ` Andi Kleen
2006-08-02 4:57 ` Eric W. Biederman
2006-08-02 5:21 ` Andi Kleen
2006-08-02 6:44 ` Eric W. Biederman
2006-08-02 3:06 ` Eric W. Biederman
2006-08-02 3:10 ` Andi Kleen
2006-08-02 5:27 ` Eric W. Biederman
2006-08-02 5:44 ` Andi Kleen
2006-08-02 7:14 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 10/33] i386: Relocatable kernel support Eric W. Biederman
2006-08-01 13:34 ` Mika Penttilä
2006-08-01 18:07 ` Eric W. Biederman
2006-08-01 18:11 ` Sam Ravnborg
2006-08-01 18:16 ` Mika Penttilä
2006-08-01 11:03 ` [PATCH 11/33] i386 boot: Add an ELF header to bzImage Eric W. Biederman
2006-08-01 22:10 ` Jeremy Fitzhardinge
2006-08-02 2:38 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 12/33] x86_64: fixup indentation in e820.c Eric W. Biederman
2006-08-01 11:03 ` [PATCH 13/33] x86_64: Remove assumptions about the kernel start address from e820/bad_addr() Eric W. Biederman
2006-08-01 11:03 ` [PATCH 14/33] x86_64: Properly report in /proc/iomem the kernel address Eric W. Biederman
2006-08-01 11:03 ` [PATCH 15/33] x86_64: Fix kernel direct mapping size check Eric W. Biederman
2006-08-01 11:03 ` [PATCH 16/33] x86_64: Assembly safe page.h and pgtable.h Eric W. Biederman
2006-08-01 11:03 ` [PATCH 17/33] x86_64: Separate normal memory map initialization from the hotplug case Eric W. Biederman
2006-08-01 11:03 ` [PATCH 18/33] x86_64: Kill temp_boot_pmds Eric W. Biederman
2006-08-01 19:02 ` Andi Kleen
2006-08-02 2:08 ` Eric W. Biederman
2006-08-01 19:04 ` [PATCH 18/33] x86_64: Kill temp_boot_pmds II Andi Kleen
2006-08-02 2:11 ` Eric W. Biederman
2006-08-02 3:07 ` Andi Kleen
2006-08-02 5:35 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 19/33] x86_64: Cleanup the early boot page table Eric W. Biederman
2006-08-01 11:03 ` [PATCH 20/33] x86_64: fix early_printk to use the standard ISA mapping Eric W. Biederman
2006-08-01 11:03 ` [PATCH 21/33] x86_64: modify copy_bootdata to use virtual addresses Eric W. Biederman
2006-08-01 11:03 ` [PATCH 22/33] x86_64: Fix gdt table size in trampoline.S Eric W. Biederman
2006-08-01 18:59 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 23/33] x86_64: cleanup segments Eric W. Biederman
2006-08-01 11:03 ` [PATCH 24/33] x86_64: Add EFER to the set registers saved by save_processor_state Eric W. Biederman
2006-08-01 11:03 ` [PATCH 25/33] x86_64: 64bit PIC SMP trampoline Eric W. Biederman
2006-08-01 19:13 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 26/33] x86_64: 64bit PIC ACPI wakeup Eric W. Biederman
2006-08-01 19:10 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 27/33] x86_64: Modify discover_ebda to use virtual addresses Eric W. Biederman
2006-08-01 11:03 ` [PATCH 28/33] x86_64: Remove the identity mapping as early as possible Eric W. Biederman
2006-08-01 19:15 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 29/33] x86_64: __pa and __pa_symbol address space separation Eric W. Biederman
2006-08-01 11:03 ` [PATCH 30/33] x86_64: Remove CONFIG_PHYSICAL_START Eric W. Biederman
2006-08-01 11:03 ` [PATCH 31/33] x86_64 boot: Add serial output support to the decompressor Eric W. Biederman
2006-08-01 11:03 ` [PATCH 32/33] x86_64: Relocatable kernel support Eric W. Biederman
2006-08-01 19:11 ` Andi Kleen
2006-08-02 2:25 ` Eric W. Biederman
2006-11-05 6:02 ` Yinghai Lu
2006-11-05 6:52 ` Eric W. Biederman
2006-11-05 7:15 ` Yinghai Lu
2006-08-01 11:03 ` [PATCH 33/33] x86_64: Make bzImage a valid 64bit elf executable Eric W. Biederman
2006-08-01 19:26 ` [RFC] ELF Relocatable x86 and x86_64 bzImages Vivek Goyal
2006-08-01 20:13 ` Jan Kratochvil
2006-08-01 20:25 ` H. Peter Anvin
2006-08-02 2:02 ` Eric W. Biederman
2006-08-01 20:40 ` Vivek Goyal
2006-08-02 2:40 ` Eric W. Biederman
2006-08-02 6:34 ` Magnus Damm
2006-08-02 7:09 ` Eric W. Biederman
2006-08-02 8:34 ` Magnus Damm
2006-08-02 9:59 ` Eric W. Biederman
2006-08-02 18:37 ` [Fastboot] " Don Zickus
2006-08-03 1:00 ` Eric W. Biederman
2006-08-03 4:53 ` H. Peter Anvin
2006-08-04 22:56 ` Vivek Goyal
2006-08-04 23:14 ` Eric W. Biederman
2006-08-04 23:38 ` Dave Jones
2006-08-04 23:47 ` H. Peter Anvin [this message]
2006-08-05 8:01 ` Eric W. Biederman
2006-08-08 3:34 ` Horms
2006-08-08 4:32 ` H. Peter Anvin
2006-08-08 4:57 ` Magnus Damm
2006-08-08 5:04 ` Eric W. Biederman
2006-08-08 6:09 ` Horms
2006-08-08 7:23 ` Eric W. Biederman
2006-08-08 7:58 ` Horms
2006-08-09 14:56 ` D. Hazelton
2006-08-17 18:44 ` Vivek Goyal
2006-08-11 13:11 ` [Fastboot] " Rachita Kothiyal
2006-08-11 13:36 ` Vivek Goyal
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