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Date: Mon, 04 Jun 2012 20:27:01 +0200
From: Lutz Vieweg <lvml@....de>
To: linux-kernel@...r.kernel.org
Subject: Improving SD/SDHC/SDXC write performance by using a discard/TRIM
like operation
When I read reports from (non-expert) users who claimed that they were able
to restore the initial write performance of their SDXC cards by using a "special
formatter tool" (while normal "formatting" did not improve performance),
I was very sceptical, as I also had read that there is no way to discard/TRIM
blocks on SD/SDHC/SDXC cards.
But then I noticed that this "special formatter" tool was actually offered (for free)
by the SD Association:
https://www.sdcard.org/downloads/formatter_3/
... and its documentation clearly states that this tool is capable of using
"flash erase" operations on SD cards, which are said to be different from
ordinary "overwrites", see
https://www.sdcard.org/downloads/formatter_3/SDFormatter_3.1e.pdf
pages 7 ("Format type Erase" vs. "Format type Overwrite") and the screen shot on page 9.
Now I wonder: Is there really such a thing as a command to erase NAND flashes
in SD cards like there is for SSDs? If so, it would certainly be a good thing
to support it with Linux block discard...
Regards,
Lutz Vieweg
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