On Mon, Jul 21, 2014 at 01:54:56PM +0800, Lan Tianyu wrote: > Date: Mon, 21 Jul 2014 13:54:56 +0800 > From: Lan Tianyu <tianyu....@intel.com> > To: r...@rjwysocki.net, l...@kernel.org, linux-a...@vger.kernel.org, > linux-kernel@vger.kernel.org, gong.c...@linux.intel.com > Subject: Re: [PATCH] ACPI/NVS: Not save NVS region for new machines to > accelerate S3 > User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:14.0) Gecko/20120714 > Thunderbird/14.0 > > On 2014年07月21日 13:01, Chen, Gong wrote: > > On Mon, Jul 21, 2014 at 10:14:31AM +0800, Lan Tianyu wrote: > >> Date: Mon, 21 Jul 2014 10:14:31 +0800 > >> From: Lan Tianyu <tianyu....@intel.com> > >> To: r...@rjwysocki.net, l...@kernel.org, linux-a...@vger.kernel.org, > >> linux-kernel@vger.kernel.org, gong.c...@linux.intel.com > >> Subject: Re: [PATCH] ACPI/NVS: Not save NVS region for new machines to > >> accelerate S3 > >> User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:14.0) Gecko/20120714 > >> Thunderbird/14.0 > >> > >> On 2014年07月18日 16:00, Chen, Gong wrote: > >>> On Fri, Jul 18, 2014 at 01:55:22PM +0800, Lan Tianyu wrote: > >>>> Date: Fri, 18 Jul 2014 13:55:22 +0800 > >>>> From: Lan Tianyu <tianyu....@intel.com> > >>>> To: r...@rjwysocki.net, l...@kernel.org > >>>> Cc: Lan Tianyu <tianyu....@intel.com>, linux-a...@vger.kernel.org, > >>>> linux-kernel@vger.kernel.org > >>>> Subject: [PATCH] ACPI/NVS: Not save NVS region for new machines to > >>>> accelerate S3 > >>>> X-Mailer: git-send-email 1.7.9.5 > >>>> > >>>> NVS region is saved and restored unconditionally for machines without > >>>> nvs_nosave quirk during S3. Tested some new machines and the operation > >>>> is not necessary. Saving NVS region also affects S2RAM speed. The time of > >>>> NVS saving and restoring depends on the size of NVS region and it > >>>> consumes > >>>> 7~10ms normally. > >>>> > >>>> This patch is to make machines produced from 2012 to now not saving NVS > >>>> region > >>>> to accelerate S3. > >>>> > >>> The year 2012 is a mandatory value in the spec? > >>> > >> > >> No, spec indicates that this is only required for S4 and commit 2a6b697 > >> added this behavior because this can fix S3 bug on some machines. But > >> this isn't necessary for all machines and waster time for S3. So this > >> patch is to add time base quirk to change default behavior for new > >> machines. > >> > > If so, I don't think a hard-coded valud in the kernel is a good idea. > > Why not providing a quirk via a command line parameter or module parameter. > > > > There is already a kernel command "acpi_sleep=nonvs_s3" to do that. But > this needs to be set by user. Otherwise, saving/restoring NVS region > also breaks system suspend on some machines and we have added 14 > nonvs quirks in the acpisleep_dmi_table. > 14 quriks! What a terrible BIOS, isn't it? It's time to cleanup so many hacks. I'm not ACPI expert, but such yet another hack is not acceptable from my point of view.
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