Messages in this thread | | | From | (Eric W. Biederman) | Date | Fri, 05 Oct 2012 14:32:26 -0700 | Subject | Re: [PATCH 04/13] x86, mm: Revert back good_end setting for 64bit |
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Yinghai Lu <yinghai@kernel.org> writes:
> On Fri, Oct 5, 2012 at 2:04 PM, Eric W. Biederman <ebiederm@xmission.com> wrote: >>>> Is there a git commit that explains what the 'big range' problem is? >> >> At least on x86_64 this was recently tested and anywhere below 4G is >> good, and there is a patch floating around somewhere to remove this >> issue. > > patch for kernel or kexec-tools?
kernel.
The sgi guys needed a kdump kernel with 1G of ram to dump their all of the memory on one of their crazy large machines and so investigated this.
Basically they found that a kdump kernel loaded anywhere < 4G worked, the only change that was needed was to relaxy the 896M hard code.
In one test they had a kdump kernel loaded above 2G.
Eric
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