From mboxrd@z Thu Jan 1 00:00:00 1970 From: joeyli Subject: Re: [PATCH] x86, efi: change name of efi_no_storage_paranoia parameter to efi_storage_paranoia Date: Thu, 21 Nov 2013 17:53:43 +0800 Message-ID: <1385027623.6516.4090.camel@linux-s257.site> 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> <528C562B.3070008@jp.fujitsu.com> <1384934881.6516.4082.camel@linux-s257.site> <528DCED7.5070806@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <528DCED7.5070806-+CUm20s59erQFUHtdCDX3A@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Yasuaki Ishimatsu Cc: Madper Xie , 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 List-Id: linux-efi@vger.kernel.org =E6=96=BC =E5=9B=9B=EF=BC=8C2013-11-21 =E6=96=BC 18:13 +0900=EF=BC=8CYa= suaki Ishimatsu =E6=8F=90=E5=88=B0=EF=BC=9A > (2013/11/20 17:08), joeyli wrote: > > =E6=96=BC =E4=B8=89=EF=BC=8C2013-11-20 =E6=96=BC 15:26 +0900=EF=BC=8C= Yasuaki Ishimatsu =E6=8F=90=E5=88=B0=EF=BC=9A > >> (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 st= orage. > >>>>>> Thus I want a way to not need to specify efi_no_storage_parano= ia > >>>>>> parameter. > >>>>> > >>>>> The efi_no_storage_paranoia parameter was introduced because so= me > >>>>> machines do not initiate garbage collection of the NVRAM until = you > >>>>> allocate all space - basically it's a switch to turn off the "s= ave 5KB > >>>>> of stoarge at all times" workaround that is needed to avoid bri= cking > >>>>> some machines. > >>>>> > >>>>> The intention of the switch is not to allow you to fill your NV= RAM just > >>>>> because you can. If that is something you want to do then I thi= nk it's > >>>>> fair to require you to explicitly turn on efi_no_storage_parano= ia. But > >>>>> I'm assuming here that you are doing something like writing lot= s and > >>>>> lots of pstore entries and just want to write as many as your v= ariable > >>>>> 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 L= inux boots up, > >>>> the remaining NVRAM is less than 5Kbyte. So I cannnot add new en= try. > >>>> > >>> Howdy Yasuaki, > >>> If the remaining NVRAM is less than 5Kb, your writing will tr= igger a > >>> NVRAM storage reclamation. However you still failed creating = entry. So > >>> I'm just curious what itmes occupy lots of nvram storage spac= e. > >> > >> Even if we got EFI_OUT_OF_RESOURCES while running Linux, gc does n= ot run. > >> Trigger of gc is when EFI_OUT_OF_RESOURCES occurs on pre OS enviro= nment with > >> UEFI. So on my system, if EFI_OUT_OF_RESOURCES occurs by the 5Kbyt= e threshold, > >> we cannot use nvram storage until EFI_OUT_OF_RESOURCES occurs on p= re 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? >=20 > Yes. I can trigger gc by EFI_OUT_OF_RESOUCE in EFI shell on my machin= e. >=20 > Thanks, > Yasuaki Ishimatu >=20 OK, then maybe can try to trigger gc in EFI stub before ExitBootService().=20 Another problem is what's the reasonable threshold. The threshold shoul= d bigger then 5Kbyte, then we write a dummy BootTime NV variable to trigger gc. Thanks Joey Lee