linux-kernel - Re: [PATCH] mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency

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Message-ID: <m2ei1v76f1.fsf@bob.laptop.org>
Date:	Tue, 12 Jul 2011 13:30:42 -0400
From:	Chris Ball <cjb@...top.org>
To:	Manoj Iyer <manoj.iyer@...onical.com>
Cc:	linux-kernel@...r.kernel.org, jbarnes@...tuousgeek.org,
	matsumur@....ricoh.co.jp, linux-pci@...r.kernel.org,
	linux-mmc@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency

Hi,

On Tue, Jul 12 2011, Manoj Iyer wrote:
> btw only the 1st write was slower, subsequent writes looks ok.
> [..]
> I have attached the output of flashbench and the time test to
>
> http://launchpad.net/bugs/773524
> [..]
> == Finding the number of open erase blocks ==
> u@u:~/flash/flashbench$ sudo ./flashbench -O --erasesize=$[4 * 1024 *
> 1024] --blocksize=$[256 * 1024] /dev/mmcblk0  --open-au-nr=2
> 4MiB    6.36M/s
> 2MiB    6.24M/s
> 1MiB    6.17M/s
> 512KiB  6.19M/s
> 256KiB  6.22M/s
> u@u:~/flash/flashbench$
> [..]
> ====== AFTER PATCH ========
> [..]
> == Finding the number of open erase blocks ==
> u@u:~/flash/flashbench$ sudo ./flashbench -O --erasesize=$[4 * 1024 *
> 1024]         --blocksize=$[256 * 1024] /dev/mmcblk0  --open-au-nr=2
> [sudo] password for u:
> 4MiB    5.49M/s
> 2MiB    6.22M/s
> 1MiB    6.22M/s
> 512KiB  6.21M/s
> 256KiB  6.21M/s
> u@u:~/flash/flashbench$

That's interesting.  Arnd, any idea why only the first test of the
flashbench run would be slower after the patch?

Thanks,

- Chris.
-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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