From mboxrd@z Thu Jan  1 00:00:00 1970
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Wed, 29 Oct 2014 10:05:15 +0000
Subject: Re: [PATCH v3 0/9] R-Car Gen2 DMA Controller driver
Message-Id: <3953456.vcBixFVi2P@avalon>
List-Id: <linux-sh.vger.kernel.org>
References: <1414345216-14486-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com>
In-Reply-To: <1414345216-14486-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com>
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To: linux-sh@vger.kernel.org

Hi Geert,

On Wednesday 29 October 2014 10:59:48 Geert Uytterhoeven wrote:
> On Wed, Oct 29, 2014 at 10:49 AM, Laurent Pinchart wrote:
> > I've performed quick SDHI performance tests yesterday. Read performance
> > were around 7.5% lower with DMA support. Write performances varied but
> > seemed similar on average.
> > 
> > - PIO
> > 
> > # time dd if=/dev/mmcblk1 of=/mnt/ram/mmc.bin count2768 bs@96
> > 262144+0 records in
> > 262144+0 records out
> 
> 262144 records? Did it get split in 512 byte records?

I knew I should have replaced the whole results instead of copying only the 
lines I thought had changed between tests :-) The times correspond to 32768 
blocks of 4kB despite what the number of records say.

> > # time dd of=/dev/mmcblk1 if=/mnt/ram/mmc.bin count2768 bs@96
> > 32+0 records in
> > 32+0 records out
> 
> Only 32 records?
> 
> > - DMA
> > 
> > # time dd if=/dev/mmcblk1 of=/mnt/ram/mmc.bin count2768 bs@96
> > 32+0 records in
> > 32+0 records out
> 
> Only 32 records?
> 
> > # time dd of=/dev/mmcblk1 if=/mnt/ram/mmc.bin count2768 bs@96
> > 32768+0 records in
> > 32768+0 records out
> 
> OK

-- 
Regards,

Laurent Pinchart