Re: [Patch 0/7] Implement crashkernel=auto
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- To: Andi Kleen <andi@xxxxxxxxxxxxxx>
- Subject: Re: [Patch 0/7] Implement crashkernel=auto
- From: Bernhard Walle <bernhard.walle@xxxxxx>
- Date: Fri, 07 Aug 2009 23:26:09 +0200
- Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, Amerigo Wang <amwang@xxxxxxxxxx>, Neil Horman <nhorman@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, tony.luck@xxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxx>, Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>, Kexec Mailing List <kexec@xxxxxxxxxxxxxxxxxxx>
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Andi Kleen schrieb:
>> As an initial approximation I would use a 32nd of low memory.
>
> That means a 1TB machine will have a 32GB crash kernel.
>
> Surely that's excessive?!?
>
> It would be repeating all the same mistakes people made with hash tables
> several years ago.
The idea of Eric was to shrink the reserved memory in an init script. I
doubt that the 1 TB machine will have any problems or performance issue
when booting with (1 TB - 32 GB) memory.
> It doesn't sound reasonable to Andi.
>
> Why do you even want to grow the crash kernel that much? Is there
> any real problem with a 64-128MB crash kernel?
Try it out. No chance for 64-128MB crashkernel on "medium" IA64 machines.
Regards,
Bernhard
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