linux-kernel - Re: [PATCH] powercap/rapl: handle domain energy unit

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Date:	Fri, 13 Mar 2015 03:53:17 -0700
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	kazutomo <kazutomo.yoshii@...il.com>
Cc:	Linux PM <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH] powercap/rapl: handle domain energy unit

On Thu, 12 Mar 2015 17:50:20 -0500
kazutomo <kazutomo.yoshii@...il.com> wrote:

> On 03/12/2015 05:05 PM, Jacob Pan wrote:
> > On Thu, 12 Mar 2015 16:59:43 -0500
> > kazutomo <kazutomo.yoshii@...il.com> wrote:
> >
> >>> according to the document, future DRAM energy unit will always be
> >>> hardcoded to 15.3uJ, no enumeration since there is no domain
> >>> specific MSR for energy unit.  
> >> Which document are you referring to?
> > Intel DocID:330784-001 Sept 2014
> > Intel Xeon Processor E5-1600 and E5-2600 V2 of 2.
> 
> I think V2 is Ivy Bridge.  Is this typo?
>  
v2 is volume 2, glad you found the doc.

BTW, i just sent out v2 of the patch to address the issues, changes are
1. use pJ for driver energy unit
2. fix max_energy_range_uj, makes it per domain
3. add reference doc info to commit message

Thanks,

Jacob
> By googling, I found a datasheet titled:
> "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, Volume
> 2 of 2. Datasheet, September 2014, Reference Number: 330784-001 "
> 
> It clearly says "ENERGY_UNIT for DRAM domain is 15.3uJ."
> 
> - kaz
> 




-- 
Jacob Pan
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