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Date: Mon, 13 Feb 2012 13:16:34 +0800
Message-ID: <CAAJw_Zsxj9VKpnB7fGWnkqRUKG1DahCV6dKyGTfeAybhqn4KUw@mail.gmail.com>
Subject: Re: mmc sdhci mmcblk0: error -110 sending status command, retrying
From: Jeff Chua <jeff.chua.linux@gmail.com>
To: Philip Rakity <prakity@marvell.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>, Chris Ball <cjb@laptop.org>,
        Pierre Ossman <pierre@ossman.eu>, lkml <linux-kernel@vger.kernel.org>,
        "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        "arindam.nath@amd.com" <arindam.nath@amd.com>,
        "zhangfei.gao@gmail.com" <zhangfei.gao@gmail.com>
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On Mon, Feb 13, 2012 at 12:41 PM, Jeff Chua <jeff.chua.linux@gmail.com> wrote:
> I ran tests for frequency that works dd out 1G of data from 8MHz to
> 16MHz, and it seems frequency less than 8.4MHz can only transfer at
> rate of 14.3MB/s and above 8.4MHz, speed goes up to 18.3 MB/s. Above
> 17MHz, errors encounters.
>
> hz1 ?8000000 ?73.5029 s ?14.3 MB/s
> hz2 ?8000000 ?73.4740 s ?14.3 MB/s
> hz3 ?8000000 ?73.3982 s ?14.3 MB/s
> hz1 ?8200000 ?71.9677 s ?14.6 MB/s
> hz2 ?8200000 ?73.4936 s ?14.3 MB/s
> hz3 ?8200000 ?73.3462 s ?14.3 MB/s
> hz1 ?8400000 ?56.6296 s ?18.5 MB/s
> hz2 ?8400000 ?56.7616 s ?18.5 MB/s
> hz3 ?8400000 ?56.7926 s ?18.5 MB/s
> hz1 ?8600000 ?56.6622 s ?18.5 MB/s
> hz2 ?8600000 ?56.7201 s ?18.5 MB/s
> hz3 ?8600000 ?56.6476 s ?18.5 MB/s
> hz1 ?8800000 ?56.8846 s ?18.4 MB/s
> hz2 ?8800000 ?56.8226 s ?18.5 MB/s
> hz3 ?8800000 ?56.7070 s ?18.5 MB/s

I've turned on write, and there's no error writing. But speed is
slower than accessing it via USB2 SD card reader. Same SD.

Via SD PCI
8.779 sec  4.04 %cpu
Via USB Reader
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