From: Chris Ball <cjb@laptop.org>
To: Manoj Iyer <manoj.iyer@canonical.com>
Cc: linux-kernel@vger.kernel.org, jbarnes@virtuousgeek.org,
matsumur@nts.ricoh.co.jp, linux-pci@vger.kernel.org,
linux-mmc@vger.kernel.org
Subject: Re: [PATCH] mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency
Date: Tue, 12 Jul 2011 12:20:17 -0400 [thread overview]
Message-ID: <m2ipr779oe.fsf@bob.laptop.org> (raw)
In-Reply-To: <alpine.DEB.2.02.1107121050480.1767@lazy> (Manoj Iyer's message of "Tue, 12 Jul 2011 11:01:15 -0500 (CDT)")
Hi Manoj,
On Tue, Jul 12 2011, Manoj Iyer wrote:
> Test System: ThinkPad X220 Tablet, using Sandisk 2GB Class 2 SD, I did
> not see any considerable change in read/write times. Also, tested a
> Transcend MMCPlus 2GB card, before the patch was applied it would not
> mount the card, and would cause IO errors on read/write, but after the
> patch it mounts and works correctly.
> [..]
> ============ BEFORE THE PATCH ===============
> Sandisk 2GB Class2 SD
> =============================================
> === WRITE ===
> u@u:~$ ls -lh test.file
> -rw-r--r-- 1 u u 10M 2011-07-12 10:19 test.file
> u@u:~$ time cp test.file /media/E0FD-1813/copyto
>
> real 0m0.480s
> user 0m0.000s
> sys 0m0.024s
> [..]
> ============ AFTER THE PATCH =============
> Sandisk 2GB Class2 SD
> ==========================================
>
> === WRITE ===
> u@u:~$ time cp ./test.file /media/E0FD-1813/copyto1
>
> real 0m0.757s
> user 0m0.000s
> sys 0m0.044s
This suggests that there *was* a considerable difference in write speed, no?
It might be helpful to use Arnd's flashbench tool¹ for further benchmarking,
since it does the right thing with using direct I/O access without caches.
Thanks,
- Chris.
¹: http://git.linaro.org/gitweb?p=people/arnd/flashbench.git
--
Chris Ball <cjb@laptop.org> <http://printf.net/>
One Laptop Per Child
next prev parent reply other threads:[~2011-07-12 16:20 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-11 21:28 [Patch 0/1] mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency Manoj Iyer
2011-07-11 21:28 ` [PATCH] " Manoj Iyer
2011-07-11 21:53 ` Chris Ball
2011-07-11 22:55 ` Manoj Iyer
2011-07-12 16:01 ` Manoj Iyer
2011-07-12 16:20 ` Chris Ball [this message]
2011-07-12 17:09 ` Manoj Iyer
2011-07-12 17:30 ` Chris Ball
2011-07-12 18:00 ` Arnd Bergmann
2011-07-13 14:45 ` Chris Ball
2011-07-13 15:42 ` Manoj Iyer
2011-07-13 16:35 ` Arnd Bergmann
2011-07-13 16:46 ` Manoj Iyer
2011-07-13 16:55 ` Chris Ball
2011-07-13 17:02 ` Manoj Iyer
2011-07-13 17:08 ` Chris Ball
2011-07-18 20:36 ` Manoj Iyer
2011-07-18 20:40 ` Chris Ball
2011-07-18 20:47 ` Manoj Iyer
2011-07-18 21:05 ` Chris Ball
2011-07-18 21:12 ` Manoj Iyer
2011-07-19 19:43 ` Manoj Iyer
2012-11-22 0:29 ` Chris Ball
2012-11-26 16:42 ` Manoj Iyer
2012-11-26 16:57 ` Chris Ball
2011-07-13 16:50 ` Chris Ball
2011-07-13 16:54 ` Manoj Iyer
2011-07-18 23:27 ` Jesse Barnes
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