linux-kernel - Re: [PATCH v1 0/4]mmc: enable eMMC4.41 new feature background operations and HPI

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Message-ID: <AANLkTinvfjAZOyuiM2T8Vtj-vxS59P1HNzjKAjPiOzb_@mail.gmail.com>
Date:	Wed, 24 Nov 2010 17:12:17 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Chuanxiao Dong <chuanxiao.dong@...el.com>
Cc:	linux-mmc@...r.kernel.org, cjb@...top.org,
	linux-kernel@...r.kernel.org, alan@...ux.intel.com,
	arjan@...ux.intel.com, hang.yuan@...el.com,
	정재훈 <jh80.chung@...sung.com>
Subject: Re: [PATCH v1 0/4]mmc: enable eMMC4.41 new feature background
 operations and HPI

Hi,

Basic question. Do you have any performance gain or improvement?
In my test environment. no performance gain. Yes I know it's not for
performance improvement.

How to measure or check it has some improvement?
Any ideas?

Thank you,
Kyungmin Park

On Tue, Nov 23, 2010 at 5:43 PM, Chuanxiao Dong
<chuanxiao.dong@...el.com> wrote:
> Hi,
>        These patches were enabled eMMC4.41 standard new feature: background
>        operations and HPI.
>
>        Since these two features are opertional, driver only enable for those
>        eMMC card which supports them.
>
>        HPI can interrupt both background operations and low priority foreground
>        operations. In these patches, only implemented using HPI to interrupt
>        background operations.
>
>        patch1: enable background operations feature for supported eMMC card.
>        patch2: let eMMC card do background operations when user reqeust queue
>        is idle. In this patch, also considered when driver added runtime power
>        management.
>        patch3: enable HPI feature for supported eMMC card.
>        patch4: use HPI to interrupt background operations if there is user
>        request(foreground operations).
>
> Thanks
> Chuanxiao
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