Re: [PATCH] x86, efi: change name of efi_no_storage_paranoia parameterto efi_storage_paranoia

[Yasuaki Ishimatsu]

(2013/11/20 17:08), joeyli wrote:
> æ äï2013-11-20 æ 15:26 +0900ïYasuaki Ishimatsu æåï
> > (2013/11/19 12:16), Madper Xie wrote:
> > > isimatu.yasuaki@xxxxxxxxxxxxxx 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
>
> Can we try to trigger gc by EFI_OUT_OF_RESOURCE in EFI stub kernel or
> EFI boot loader to recover NVRAM space? Does work with the BIOS on this
> machine?

Yes. I can trigger gc by EFI_OUT_OF_RESOUCE in EFI shell on my machine.

Thanks,
Yasuaki Ishimatu

> Thanks a lot!
> Joey Lee


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