From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yasuaki Ishimatsu Subject: Re: [PATCH] x86, efi: change name of efi_no_storage_paranoia parameter to efi_storage_paranoia Date: Wed, 20 Nov 2013 15:26:51 +0900 Message-ID: <528C562B.3070008@jp.fujitsu.com> References: <527C93B5.7010407@jp.fujitsu.com> <527C9B5C.6040509@nod.at> <527CB013.30200@jp.fujitsu.com> <527CB0F4.8080606@nod.at> <527CBC05.6080505@jp.fujitsu.com> <527CBD01.1000908@nod.at> <527CBDD3.2020609@jp.fujitsu.com> <20131108143421.GB22636@console-pimps.org> <52809AEB.9080100@jp.fujitsu.com> <20131111105424.GD22636@console-pimps.org> <528AD50D.6060503@jp.fujitsu.com> <87siutqdwv.fsf@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-2022-JP" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <87siutqdwv.fsf-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Madper Xie Cc: Matt Fleming , Richard Weinberger , linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org, jlee-IBi9RG/b67k@public.gmane.org List-Id: linux-efi@vger.kernel.org (2013/11/19 12:16), Madper Xie wrote: > > isimatu.yasuaki-+CUm20s59erQFUHtdCDX3A@public.gmane.org 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. Even if we got EFI_OUT_OF_RESOURCES while running Linux, gc does not run. Trigger of gc is when EFI_OUT_OF_RESOURCES occurs on pre OS environment with UEFI. So on my system, if EFI_OUT_OF_RESOURCES occurs by the 5Kbyte threshold, we cannot use nvram storage until EFI_OUT_OF_RESOURCES occurs on pre OS environment with UEFI. Thanks, Yasuaki Ishimatsu > >> Thanks, >> Yasuaki Ishimatsu > > -- > Best, > Madper >