From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Jingoo Han <jg1.han@samsung.com>,
linux-kernel@vger.kernel.org,
Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
linux-mtd@lists.infradead.org,
Brian Norris <computersforpeace@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/2] mtd: orion-nand: fix build error with ARMv4
Date: Fri, 9 May 2014 20:55:06 -0300 [thread overview]
Message-ID: <20140509235506.GA792@arch.cereza> (raw)
In-Reply-To: <4160510.VJSlHZLhNz@wuerfel>
On 10 May 12:24 AM, Arnd Bergmann wrote:
> On Friday 09 May 2014 19:09:15 Ezequiel Garcia wrote:
> > # time nanddump /dev/mtd5 -f /dev/null -q
> > real 0m 5.82s
> > user 0m 0.20s
> > sys 0m 5.60s
> >
> > Jason: Care to submit a proper patch?
> >
> > On 08 May 04:56 PM, Arnd Bergmann wrote:
> > > Ok, that is a noticeable difference. For scale, what is the size of that partition?
> >
> > The board is Openblocks A6, running mainline.
> >
> > # cat /proc/mtd
> > dev: size erasesize name
> > mtd0: 00090000 00004000 "uboot"
> > mtd1: 00044000 00004000 "env"
> > mtd2: 00024000 00004000 "test"
> > mtd3: 00400000 00004000 "conf"
> > mtd4: 01d20000 00004000 "linux"
> > mtd5: 01dec000 00004000 "user"
>
> Ok, so it takes 5.6 seconds in kernel mode to access 31MB, which comes down
> to 5.60MB/s. That isn't very fast compared to the time the CPU should take
> for those instructions, so I'm surprised it actually makes any difference
> at all.
>
> There isn't a usable slave DMA engine in Armada XP by chance?
>
The Openblocks A6 is a Kirkwood, not Armada XP.
--
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
next prev parent reply other threads:[~2014-05-09 23:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-08 14:46 [PATCH 00/22] Random ARM randconfig fixes in drivers Arnd Bergmann
[not found] ` <1399560990-1402858-1-git-send-email-arnd@arndb.de>
2014-05-08 14:56 ` [PATCH 1/2] mtd/onenand: fix build warning for dma type Arnd Bergmann
2014-05-12 23:26 ` Brian Norris
2014-05-08 14:56 ` [PATCH 2/2] mtd: orion-nand: fix build error with ARMv4 Arnd Bergmann
2014-05-09 18:45 ` Ezequiel Garcia
2014-05-09 19:29 ` Geert Uytterhoeven
2014-05-09 20:12 ` Arnd Bergmann
2014-05-09 21:28 ` Jason Gunthorpe
2014-05-09 22:09 ` Ezequiel Garcia
2014-05-09 22:24 ` Arnd Bergmann
2014-05-09 23:55 ` Ezequiel Garcia [this message]
2014-05-13 20:55 ` Jason Gunthorpe
2014-05-14 11:47 ` Arnd Bergmann
2014-05-14 12:35 ` Geert Uytterhoeven
2014-05-14 13:09 ` Arnd Bergmann
2014-05-08 16:41 ` [PATCH 00/22] Random ARM randconfig fixes in drivers Guenter Roeck
2014-05-09 11:48 ` Arnd Bergmann
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