linux-kernel - Re: [PATCH 3/3] x86, crash: Allocate enough low-mem when crashkernel=high

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Message-ID: <20150123170243.GG22635@pd.tnic>
Date:	Fri, 23 Jan 2015 18:02:43 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 3/3] x86, crash: Allocate enough low-mem when
 crashkernel=high

On Tue, Jan 06, 2015 at 03:51:14PM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> When the crashkernel is loaded above 4GiB in memory the
> first kernel only allocates 72MiB of low-memory for the DMA
> requirements of the second kernel. On systems with many
> devices this is not enough and causes device driver
> initialization errors and failed crash dumps. Set this
> default value to 256MiB to make sure there is enough memory

This upper limit of 256 looks arbitrary. Are we going to raise it a
couple of years from now if it becomes insufficient then?

It probably won't be easy but is there some more reliable way to
allocate enough memory for DMA on a say per-system basis or whatever...?
Probably not but let me ask it anyway.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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