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  • 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

    From Linus Walleij@21:1/5 to Pavel Machek on Mon Oct 2 14:10:01 2017
    On Mon, Oct 2, 2017 at 10:41 AM, Pavel Machek <pavel@ucw.cz> wrote:

    Bounce buffers are being removed from v4.15

    As Adrian states, this would make any last bugs go away. I would
    even consider putting this patch this into fixes if it solves the problem.

    although you may experience
    performance regression with that:

    https://marc.info/?l=linux-mmc&m=150589778700551

    Hmm. The performance of this is already pretty bad, I really hope it
    does not get any worse.

    Did you use bounce buffers? Those were improving performance on
    some laptops with TI or Ricoh host controllers and nothing else was
    ever really using it (as can be seen from the commit).

    Yours,
    Linus Walleij

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  • From Pavel Machek@21:1/5 to Linus Walleij on Mon Oct 2 15:10:03 2017
    On Mon 2017-10-02 14:06:03, Linus Walleij wrote:
    On Mon, Oct 2, 2017 at 10:41 AM, Pavel Machek <pavel@ucw.cz> wrote:

    Bounce buffers are being removed from v4.15

    As Adrian states, this would make any last bugs go away. I would
    even consider putting this patch this into fixes if it solves the problem.

    although you may experience
    performance regression with that:

    https://marc.info/?l=linux-mmc&m=150589778700551

    Hmm. The performance of this is already pretty bad, I really hope it
    does not get any worse.

    Did you use bounce buffers? Those were improving performance on
    some laptops with TI or Ricoh host controllers and nothing else was
    ever really using it (as can be seen from the commit).

    Thinkpad X220... how do I tell if I was using them? I believe so,
    because I uncovered bug in them before.

    Pavel --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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