Re: alcor mmc driver slow I/O

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On Mon, 18 Mar 2019 at 12:01, Oleksij Rempel <linux@xxxxxxxxxxxxxxxx> wrote:
>
> Hi Daniel,
>
> Am 18.03.19 um 10:09 schrieb Daniel Drake:
> > Hi Oleksij,
> >
> > Thanks again for your work on the new mmc alcor driver.
> >
> > Testing it quickly for the first time, with a Transcend Class 10 32GB
> > SD card that I have on hand (on Asus P4540UQ / AU6621). The driver
> > seems to be working (cool!), but I/O performance is much lower than
> > the ugly vendor driver (ampe_stor).
> >
> > dd if=/dev/XXX of=/dev/null bs=1M count=32
> >
> > On ampe_stor : 12.1mb/sec
> > On new alcor driver: 364kb/sec
>
> Uff... 364kb/sec is wary low. Feels like due some errors or missing capabilities the HI speed is not
> enabled.

Well, nothing have really changed in regards to this.

Perhaps try a plain v5.0 and compare with v5.1 rc1 to see if this is regression?

[...]

Kind regards
Uffe



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