linux-kernel - Re: [PATCH v3] mmc: rtsx: improve performance for multi block rw

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Date:   Thu, 23 Dec 2021 11:37:16 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Ricky WU <ricky_wu@...ltek.com>
Cc:     "tommyhebb@...il.com" <tommyhebb@...il.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] mmc: rtsx: improve performance for multi block rw

On Thu, 23 Dec 2021 at 11:27, Ricky WU <ricky_wu@...ltek.com> wrote:
>
> > -----Original Message-----
> > From: Ulf Hansson <ulf.hansson@...aro.org>
> > Sent: Tuesday, December 21, 2021 8:51 PM
> > To: Ricky WU <ricky_wu@...ltek.com>
> > Cc: tommyhebb@...il.com; linux-mmc@...r.kernel.org;
> > linux-kernel@...r.kernel.org
> > Subject: Re: [PATCH v3] mmc: rtsx: improve performance for multi block rw
> >
> > On Tue, 21 Dec 2021 at 13:24, Ricky WU <ricky_wu@...ltek.com> wrote:
> > >
> > > Improving performance for the CMD is multi-block read/write and the
> > > data is sequential.
> > > sd_check_multi_seq() to distinguish multi-block RW (CMD 18/25) or
> > > normal RW (CMD 17/24) if the CMD is multi-block and the data is
> > > sequential then call to sd_rw_multi_seq()
> > >
> > > This patch mainly to control the timing of reply at CMD 12/13.
> > > Originally code driver reply CMD 12/13 at every RW (CMD 18/25).
> > > The new code to distinguish multi-block RW(CMD 18/25) and the data is
> > > sequential or not, if the data is sequential RW driver do not send CMD
> > > 12 and bypass CMD 13 until wait the different direction RW CMD or
> > > trigger the delay_work to sent CMD 12.
> > >
> > > run benchmark result as below:
> > > SD Card : Samsumg Pro Plus 128GB
> > > Number of Samples:100, Sample Size:10MB <Before> Read : 86.9 MB/s,
> > > Write : 38.3 MB/s <After>  Read : 91.5 MB/s, Write : 55.5 MB/s
> >
> > A much nicer commit message, thanks a lot! Would you mind running some
> > additional tests, like random I/O read/writes?
> >
> > Also, please specify the benchmark tool and command you are using. In the
> > meantime, I will continue to look at the code.
> >
>
> The Tool just use Ubuntu internal GUI benchmark Tool in the "Disks"
> and the Tool don't have random I/O to choice...
>
> Do you have any suggestion for testing random I/O
> But we think random I/O will not change much

I would probably look into using fio, https://fio.readthedocs.io/en/latest/

Another option that I use frequently is iozone, https://www.iozone.org.
Here's a command line that I often use for iozone
./iozone -az -i0 -i1 -s 20m -y 16k -q 4m -I -f /mnt/sdcard/iozone.tmp -e

[...]

Kind regards
Uffe