From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: linux-sh@vger.kernel.org
Subject: Re: [PATCH v3 0/9] R-Car Gen2 DMA Controller driver
Date: Wed, 29 Oct 2014 10:05:15 +0000 [thread overview]
Message-ID: <3953456.vcBixFVi2P@avalon> (raw)
In-Reply-To: <1414345216-14486-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com>
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
next prev parent reply other threads:[~2014-10-29 10:05 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-26 17:40 [PATCH v3 0/9] R-Car Gen2 DMA Controller driver Laurent Pinchart
2014-10-27 0:45 ` Simon Horman
2014-10-28 3:03 ` Kuninori Morimoto
2014-10-28 21:02 ` Laurent Pinchart
2014-10-29 0:04 ` Kuninori Morimoto
2014-10-29 2:36 ` Magnus Damm
2014-10-29 7:24 ` Magnus Damm
2014-10-29 9:49 ` Laurent Pinchart
2014-10-29 9:49 ` Phil Edworthy
2014-10-29 9:59 ` Geert Uytterhoeven
2014-10-29 10:05 ` Laurent Pinchart [this message]
2014-10-29 11:15 ` Laurent Pinchart
2014-10-29 11:22 ` Laurent Pinchart
2014-10-30 0:16 ` Simon Horman
2014-10-30 13:41 ` Wolfram Sang
2014-11-04 7:07 ` Magnus Damm
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