Messages in this thread | | | Date | Fri, 4 Aug 2006 19:38:15 -0400 | From | Dave Jones <> | Subject | Re: [RFC] ELF Relocatable x86 and x86_64 bzImages |
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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 ;-)
Dave
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