On Tue, Mar 02, 2021 at 02:49:31PM -0000, Grant Edwards wrote: > Some of the serial drivers that I maintain can make a tradeoff between > CPU usage, throughput, and rx data latency. For the past 20 years, > I've based that tradeoff on the tty struct's "low_latency" flag. This > allowed the user to choose between high-throughput with low CPU usage, > or higher CPU usage with lower latency and lower total throughput. > > That low_latency flag appears to have "gone away" in v5.12. > > How are users now supposed to indicate their desire for low-latency > operation for a serial port? Given that there are no in-kernel users of this "option", perhaps hardware has caught up to the fact that it really wasn't doing anything :) Do you have proof that it was working as expected somehow? thanks, greg k-h
