linux-kernel - Re: [PATCH v4 0/5] mtd: pxa3xx

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Message-ID: <20151022174244.61eaf79e@free-electrons.com>
Date:	Thu, 22 Oct 2015 17:42:44 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc:	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	zmxu@...vell.com, jszhang@...vell.com,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Gregory Clément 
	<gregory.clement@...e-electrons.com>,
	Brian Norris <computersforpeace@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH v4 0/5] mtd: pxa3xx_nand: rework the timing setup

Dear Ezequiel Garcia,

On Thu, 22 Oct 2015 12:22:24 -0300, Ezequiel Garcia wrote:

> Could you compare NAND throughput using keep-config (keeping
> the bootloader timings) and without keep-config (with ONFI timings) ?

Seems like we are within the measurement noise. I did each test only
once, and the test lasts only a few seconds, but here are the results:

Without keep-config (i.e ONFI timings) :

# time dd if=/dev/mtd3 of=/dev/null bs=1M
32+0 records in
32+0 records out
real	0m 3.54s
user	0m 0.00s
sys	0m 0.26s

With keep-config (i.e bootloader timings)

# time dd if=/dev/mtd3 of=/dev/null bs=1M
32+0 records in
32+0 records out
real	0m 3.77s
user	0m 0.00s
sys	0m 0.21s

I.e we are apparently slightly faster with the ONFI timings. However
again, the test duration is very short, and I didn't repeat the test
several times.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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