linux-kernel - Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

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Date:   Mon, 2 Oct 2017 15:03:53 +0200
From:   Pavel Machek <pavel@....cz>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        linux-mm@...ck.org
Subject: Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

On Mon 2017-10-02 14:06:03, Linus Walleij wrote:
> On Mon, Oct 2, 2017 at 10:41 AM, Pavel Machek <pavel@....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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