linux-kernel - Re: [PATCH v7 24/27] x86: Add swiotlb force off support

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Message-ID: <CAE9FiQVhu7HFU1Ar_9WO+sUGQVKg1DgGTr-f3b6GHc5X6X6mDA@mail.gmail.com>
Date:	Mon, 24 Dec 2012 15:55:43 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 24/27] x86: Add swiotlb force off support

On Mon, Dec 24, 2012 at 3:34 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 12/21/2012 09:11 PM, Yinghai Lu wrote:
>> On Fri, Dec 21, 2012 at 7:25 PM, H. Peter Anvin <hpa@...or.com> wrote:
>>> On 12/21/2012 07:23 PM, Eric W. Biederman wrote:
>>>>
>>>> In this case YH has been working on the case of loading a kernel
>>>> completely above 4G, and apparently he has also been testing the case of
>>>> running a kernel with no memory below 4G.
>>>>
>>>
>>> It is worth noting that we cannot run with *no* memory below 4G -- it is
>>> not possible to run SMP at least without some memory below the 1M mark.
>>
>> yes need keep 8k or so for trampoline.
>>
>> but kdump only use one CPU.
>>
>
> ... except we have an active request to change that, and the trampoline
> is more like 20K depending on options.

looks like we should not worry that this now.

kdump conf scripts always append some low range under 1M for second kernel.
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