linux-kernel - Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not enough ram for it

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Message-ID: <CAE9FiQWN6QsFpx7KtiOWZ+g3d3B4nY1wR8etA8XWZiobtYtGcQ@mail.gmail.com>
Date:	Fri, 4 Jan 2013 11:57:28 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>, Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not
 enough ram for it

On Fri, Jan 4, 2013 at 8:05 AM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
>> +static bool __init enough_mem_for_swiotlb(void)
>> +{
>> +     /* do we have less than 1M RAM under 4G ? */
>
> And why 1MB? The default size is 64MB.

because kdump scripts will use memmap=exact,.. to add range below 1M
to get realmode data.
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