linux-kernel - Re: mmc sdhci mmcblk0: error -110 sending status command, retrying

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Message-ID: <CAAJw_Zsxj9VKpnB7fGWnkqRUKG1DahCV6dKyGTfeAybhqn4KUw@mail.gmail.com>
Date:	Mon, 13 Feb 2012 13:16:34 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Philip Rakity <prakity@...vell.com>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>,
	Chris Ball <cjb@...top.org>, Pierre Ossman <pierre@...man.eu>,
	lkml <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"arindam.nath@....com" <arindam.nath@....com>,
	"zhangfei.gao@...il.com" <zhangfei.gao@...il.com>
Subject: Re: mmc sdhci mmcblk0: error -110 sending status command, retrying

On Mon, Feb 13, 2012 at 12:41 PM, Jeff Chua <jeff.chua.linux@...il.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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