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 <pa...@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?
