From: Artem Bityutskiy <dedekind@infradead.org>
To: Jason Liu <liu.h.jason@gmail.com>
Cc: Linux mtd <linux-mtd@lists.infradead.org>,
Adrian Hunter <adrian.hunter@nokia.com>
Subject: Re: ubifs error when do bonnie++ test
Date: Wed, 15 Apr 2009 11:50:05 +0300 [thread overview]
Message-ID: <1239785405.3390.173.camel@localhost.localdomain> (raw)
In-Reply-To: <e8775dd00904150144w54bb1c31j1c50648190ede7f2@mail.gmail.com>
On Wed, 2009-04-15 at 16:44 +0800, Jason Liu wrote:
> We use 2 MLC nand flash to simulate this virtual device. Each NAND
> chip is 4K page size with 218 OOB size.
> We can parallel program each NAND chip in order to improve the write
> performance.
I see. Then you want to teach your setup understand sub-pages.
In your case the sub-page will be 2K. Then you'll waste much
less space in UBI. See here:
http://www.linux-mtd.infradead.org/doc/ubi.html#L_subpage
Note, with this all I/O will be in page size units (8K), only
UBI headers I/O will be in sub-page size units. So with this
you will preserve I/O speed, but lessen flash space wastage.
And just in case, please, make sure you have read this:
http://www.linux-mtd.infradead.org/faq/ubifs.html#L_ubifs_mlc
--
Best regards,
Artem Bityutskiy (Битюцкий Артём)
next prev parent reply other threads:[~2009-04-15 8:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-02 5:44 ubifs error when do bonnie++ test Jason Liu
2009-04-02 8:07 ` Adrian Hunter
2009-04-02 9:49 ` Jason Liu
2009-04-02 12:12 ` Adrian Hunter
2009-04-02 12:25 ` Artem Bityutskiy
2009-04-10 12:27 ` Artem Bityutskiy
2009-04-13 6:50 ` Jason Liu
2009-04-14 6:17 ` Artem Bityutskiy
2009-04-15 8:44 ` Jason Liu
2009-04-15 8:50 ` Artem Bityutskiy [this message]
2009-04-15 8:51 ` Artem Bityutskiy
2009-04-15 8:55 ` Artem Bityutskiy
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