linux-kernel - Re: [PATCH 0/3 v11] add reserved e820 ranges to the kdump kernel e820 table

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Message-ID: <20190612151033.GJ32652@zn.tnic>
Date:   Wed, 12 Jun 2019 17:10:33 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Baoquan He <bhe@...hat.com>, Thomas.Lendacky@....com
Cc:     lijiang <lijiang@...hat.com>, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, tglx@...utronix.de, mingo@...hat.com,
        akpm@...ux-foundation.org, dave.hansen@...ux.intel.com,
        luto@...nel.org, peterz@...radead.org, x86@...nel.org,
        hpa@...or.com, dyoung@...hat.com
Subject: Re: [PATCH 0/3 v11] add reserved e820 ranges to the kdump kernel
 e820 table

On Wed, Jun 12, 2019 at 09:55:49AM +0800, Baoquan He wrote:
> With further investigation, the failure after applying Tom's patch is
> caused by OOM. When increase crashkernel reservation to 512M, kdump
> kernel can boot successfully. I noticed your crashkernel reservation is
> 256M, that will fail and stuck there very possibly.
> 
> So Tom's patch can fix the issue. We need further check why much more
> crashkernel memory is needed on those AMD boxes with sme support..

Yes, 256M for a kexec kernel sounds pretty much enough to me. So there's
something else at play here. I wonder if that workarea after _end, from
Tom's patch, needs so much room...

-- 
Regards/Gruss,
    Boris.

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