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In-Reply-To: <20101123084309.GA17754@intel.com>
References: <20101123084309.GA17754@intel.com>
Date: Wed, 24 Nov 2010 17:12:17 +0900
Message-ID: <AANLkTinvfjAZOyuiM2T8Vtj-vxS59P1HNzjKAjPiOzb_@mail.gmail.com>
Subject: Re: [PATCH v1 0/4]mmc: enable eMMC4.41 new feature background
 operations and HPI
From: Kyungmin Park <kmpark@infradead.org>
To: Chuanxiao Dong <chuanxiao.dong@intel.com>
Cc: linux-mmc@vger.kernel.org, cjb@laptop.org, linux-kernel@vger.kernel.org,
        alan@linux.intel.com, arjan@linux.intel.com, hang.yuan@intel.com,
        =?UTF-8?B?7KCV7J6s7ZuI?= <jh80.chung@samsung.com>
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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@intel.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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