On Wed, Oct 17, 2018 at 10:20:25AM +0200, Fabien Lahoudere wrote: > Hi Greg, > > On Mon, 2018-10-15 at 16:01 +0200, Greg KH wrote: > > On Thu, Oct 11, 2018 at 11:25:03AM +0200, Fabien Lahoudere wrote: > > > In order to optimize serial communication on imx53 and imx6, we may > > > need to tweak DMA period and buffer length per period. > > > > Why can you not just automatically determine this information? What is > > userspace going to know that the kernel can not just learn now? > > > > Having tunables is nice, but it is even better to not need them at all. > > I agree that it is better to let the kernel do the configuration. Great! > However in our case we use several serial communication for different device > and one of them need to tweak that configuration to get small data with a better > period. However having this parameter for all serial port implies a bigger number > of interrupts for others too. Why can you not dynamically figure this out? How are you figuring it out "by hand" today in userspace? thanks, greg k-h
