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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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