On Tue, Feb 6, 2018 at 12:03 AM, Sagi Grimberg <sagi@xxxxxxxxxxx> wrote: > irq-am library helps I/O devices implement interrupt moderation in > an adaptive fashion, based on online stats. > > The consumer can initialize an irq-am context with a callback that > performs the device specific moderation programming and also the number > of am (adaptive moderation) levels which are also, abstracted and allows > for device specific tuning. > > The irq-am code will sample once every nr_events and will check for significant > change in workload characteristics (completions per second, events per second) > and if it detects one, will perform an am level update(called a step). > > The irq-am code assumes that the am levels are sorted in an increasing order when > the lowest level corresponds to the optimum latency tuning (short time and low > completion-count) and gradually increasing towards the throughput optimum tuning > (longer time and higher completion-count). So there is a trend and tuning direction > tracked by the moderator. When the moderator collects sufficient statistics (also > controlled by the consumer defining nr_events), it compares the current stats with the > previous stats and if a significant changed was observed in the load, the moderator > attempts to increment/decrement its current level (step) and schedules a program > dispatch work. > > Signed-off-by: Sagi Grimberg <sagi@xxxxxxxxxxx> > --- > include/linux/irq-am.h | 116 +++++++++++++++++++++++++++++++ Talking to Tal, it seems that this is what landed in upstream as include/linux/net_dim.h and can have few adjustments for you, I suggest you take a look
