linux-kernel - Re: [PATCH 2/2] mtd: orion-nand: fix build error with ARMv4

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140509235506.GA792@arch.cereza>
Date:	Fri, 9 May 2014 20:55:06 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Jingoo Han <jg1.han@...sung.com>, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 2/2] mtd: orion-nand: fix build error with ARMv4

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/