From: Simon Horman <horms@verge.net.au>
To: linux-mmc@vger.kernel.org, linux-sh@vger.kernel.org
Cc: Arnd Hannemann <arnd@arndnet.de>,
Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Subject: SDHC Read Performance
Date: Wed, 19 Jan 2011 00:09:09 +0000 [thread overview]
Message-ID: <20110119000909.GA9412@verge.net.au> (raw)
Hi,
I am currently interested in the read performance of the SDHI driver. I
ran the following tests on a Mackerel board using Linus's latest tree
(6845a44a), which I believe has all of the outstanding patches from Arnd
and Guennadi merged.
I have made the following crude performance measurements using
several different cards.
dd if=/dev/mmcblk1 of=/dev/null bsQ2 count\x100000
SD1.1: 7.0 MB/s
SD2.0: 7.0 MB/s
SDHC Class 2: 7.1 MB/s
SDHC Class 10: 7.2 MB/s
Whereas I would expect something like:
SD1.1 card: 12 MB/s
SD2.0 card: 24 MB/s
SDHC Class 2: 24 MB/s
SDHC Class 10: Faster?
Possibly relevant portions of my .config are:
CONFIG_MFD_SH_MOBILE_SDHI=y
CONFIG_TMIO_MMC_DMA=y
CONFIG_MMC_TMIO=y
Arnd, Guennadi, I believe that you have been working on SDHI recently.
If you have any suggestions I would be most grateful. Else I will
poke some more and see what I can come up with.
next reply other threads:[~2011-01-19 0:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-19 0:09 Simon Horman [this message]
2011-01-19 3:14 ` SDHC Read Performance Magnus Damm
2011-01-19 8:05 ` Simon Horman
2011-01-20 3:30 ` Simon Horman
2011-01-20 4:01 ` Magnus Damm
2011-01-20 7:07 ` Simon Horman
2011-01-20 8:28 ` Magnus Damm
2011-01-20 8:38 ` Paul Mundt
2011-01-20 8:55 ` Magnus Damm
2011-03-21 22:38 ` Simon Horman
2011-03-21 22:55 ` Arnd Bergmann
2011-03-22 7:16 ` Simon Horman
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