From: Maxim Levitsky <maximlevitsky@gmail.com>
To: "Jörn Engel" <joern@logfs.org>
Cc: linux-mtd <linux-mtd@lists.infradead.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Alex Dubov <oakad@yahoo.com>
Subject: Re: RFC: [PATCH V2 0/9 Integration of SmartMedia/xD into mtd subsystem
Date: Tue, 12 Jan 2010 00:24:31 +0200 [thread overview]
Message-ID: <1263248671.24201.7.camel@maxim-laptop> (raw)
In-Reply-To: <20100109002600.GA3258@logfs.org>
On Sat, 2010-01-09 at 01:26 +0100, Jörn Engel wrote:
> On Fri, 8 January 2010 19:40:29 +0200, Maxim Levitsky wrote:
> >
> > Btw, your cards aren't Type M, right?
> > However I use here a Type M card, and its likely to include an FTL
> > inside, thus, it might explain the low speeds I get there partially...
>
> No, mine were the old ones before marketing invented the two types.
>
> Jörn
>
I finally located the source of slowdown.
It appears to be caused by too large caching I did (5 erase blocks).
If I cache one block, write speed nears 1 MB/s.
As a bonus that makes the FTL much simplified.
Another small flaw that currently exists in my FTL is that it ignores
the underlying badblock support from mtd driver and requeres it to
expose the two bad block bytes in the oob layout, I think I can avoid
that after all.
Other that that, everything is just perfect.
I post updated patchset soon.
Best regards,
Maxim Levitsky
prev parent reply other threads:[~2010-01-11 22:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-08 15:04 RFC: [PATCH V2 0/9 Integration of SmartMedia/xD into mtd subsystem Maxim Levitsky
2010-01-08 15:05 ` [PATCH 1/9] MTD: call remove notifiers before removing the device Maxim Levitsky
2010-01-08 15:06 ` [PATCH 2/9] MTD: create lockless versions of {get,put}_mtd_device Maxim Levitsky
2010-01-08 15:21 ` [PATCH 2/9] MTD: create lockless versions of {get, put}_mtd_device Jörn Engel
2010-01-08 15:27 ` [PATCH 2/9] MTD: create lockless versions of {get,put}_mtd_device Maxim Levitsky
2010-01-08 15:31 ` [PATCH 2/9] MTD: create lockless versions of {get, put}_mtd_device Jörn Engel
2010-01-08 15:07 ` [PATCH 3/9] MTD: blkdevs: make hotplug work Maxim Levitsky
2010-01-08 15:08 ` [PATCH 4/9] MTD: make mtdtrans thread freezable Maxim Levitsky
2010-01-08 15:08 ` [PATCH 5/9] MTD: nand subsystem, export nand_do_read_oob and nand_do_write_oob Maxim Levitsky
2010-01-08 15:09 ` [PATCH 6/9] mtd: common module for smartmedia/xD support Maxim Levitsky
2010-01-08 15:10 ` [PATCH 7/9] MTD: add few workarounds to nand system for SmartMedia/xD chips Maxim Levitsky
2010-01-08 15:11 ` [PATCH 8/9] mtd: Add nand driver for ricoh xD/SmartMedia reader Maxim Levitsky
2010-01-08 15:12 ` [PATCH 9/9] mtd: Add new SmartMedia/xD FTL Maxim Levitsky
2010-01-08 15:29 ` Jörn Engel
2010-01-08 15:35 ` Maxim Levitsky
2010-01-08 16:04 ` RFC: [PATCH V2 0/9 Integration of SmartMedia/xD into mtd subsystem Jörn Engel
2010-01-08 17:40 ` Maxim Levitsky
2010-01-09 0:26 ` Jörn Engel
2010-01-11 22:24 ` Maxim Levitsky [this message]
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