mmc: core: complete/wait_for_completion performance

[Stefan Wahren]

> Jörg Krause <joerg.krause at embedded.rocks> hat am 20. November 2016 um 15:42
> geschrieben:
> 
> 
> Hi Stefan,
> 
> On Sun, 2016-11-20 at 14:28 +0100, Stefan Wahren wrote:
> > Hi Jörg,
> > 
> > > Jörg Krause <joerg.krause at embedded.rocks> hat am 20. November 2016
> > > um 13:27
> > > geschrieben:
> > > 
> > > 
> > > Hi,
> > > 
> > > I started the discussion on this mailing list in another thread
> > > [1],
> > > but I'd like to move it to a new thread, because it might be mmc
> > > specific.
> > > 
> > > The issue is that I am noticed low wifi network throughput on an
> > > i.MX28
> > > board with the mainline kernel (v4.7.10, about 6 Mbps) compared to
> > > the
> > > vendor kernel (Freescale v2.6.35.3, about 20 Mbps). The wifi chip
> > > is
> > > attached using the SDIO interface.
> > > 
> > > I started investigation where the bottleneck in the mainline
> > > kernel might come from. Therefore I checked that the configs and
> > > settings for the interfaces and drivers are the same. They are.
> > 
> > so you're not using the mxs_defconfig settings anymore?
> 
> No, I changed the settings.
> 

What happens to performance to if you change the following settings to the same
like in mxs_defconfig?

CONFIG_PREEMPT_VOLUNTARY=y
CONFIG_DEFAULT_IOSCHED="noop"