On Fri, 29 Dec 2017 15:27:03 +0100 Nirmoy Das <n...@suse.de> wrote: > Hi Ferruh, > > There is latency in the range of milliseconds when packets are passed > through KNI up to the IP stack. With CONFIG_RTE_KNI_PREEMPT_DEFAULT=n > its required sacrifice a cpu core. Do you have any suggestion to improve > latency without sacrificing a cpu? > > What do you think about using cond_resched() instead of > schedule_timeout_interruptible(), in our test it helped to reduce > latency? >
That fully consumes a CPU core when doing KNI. It would be better to figure out how to use a a NAPI style API for this. I.e keep processing packet until idle, then poll for a small window more, then if still idle wait in kernel to be kicked by syscall from user space.
