linux-kernel - Re: [PATCH] x86, efi: change name of efi_no_storage_paranoia parameter to efi_storage

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Message-ID: <87siutqdwv.fsf@redhat.com>
Date:	Tue, 19 Nov 2013 11:16:32 +0800
From:	Madper Xie <cxie@...hat.com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	Richard Weinberger <richard@....at>, linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org, matt.fleming@...el.com,
	matthew.garrett@...ula.com, jlee@...e.com
Subject: Re: [PATCH] x86, efi: change name of efi_no_storage_paranoia parameter to efi_storage_paranoia


isimatu.yasuaki@...fujitsu.com writes:

> Hi Matt,
>
> Sorry for late the reply.
>
>
> (2013/11/11 19:54), Matt Fleming wrote:
>> On Mon, 11 Nov, at 05:52:59PM, Yasuaki Ishimatsu wrote:
>>> Hi Matt,
>>>
>>> I uses FUJITSU's x86 box.
>>> This does not become bricked even if I use all efi variable storage.
>>> Thus I want a way to not need to specify efi_no_storage_paranoia
>>> parameter.
>>
>> The efi_no_storage_paranoia parameter was introduced because some
>> machines do not initiate garbage collection of the NVRAM until you
>> allocate all space - basically it's a switch to turn off the "save 5KB
>> of stoarge at all times" workaround that is needed to avoid bricking
>> some machines.
>>
>> The intention of the switch is not to allow you to fill your NVRAM just
>> because you can. If that is something you want to do then I think it's
>> fair to require you to explicitly turn on efi_no_storage_paranoia. But
>> I'm assuming here that you are doing something like writing lots and
>> lots of pstore entries and just want to write as many as your variable
>> storage will allow? Or are you doing something more fundamental like
>> creating BootXXXX entries?
>>
>> What are you doing to run into the 5KB reserve? How much NVRAM does your
>> machine come with?
>
> I just add boot entry to NVRAM by efibootmgr command. But when Linux boots up,
> the remaining NVRAM is less than 5Kbyte. So I cannnot add new entry.
>
Howdy Yasuaki,
  If the remaining NVRAM is less than 5Kb, your writing will trigger a
  NVRAM storage reclamation. However you still failed creating entry. So
  I'm just curious what itmes occupy lots of nvram storage space.

> Thanks,
> Yasuaki Ishimatsu

--
Best,
Madper
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