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SubjectRe: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card
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On 02/10/17 16:03, Pavel Machek wrote:
> 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.

You are certainly using bounce buffers. What does lspci -knn show?

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