Hi, I have a strange problem on a PREEMPT_RT system. I have a process with 2 threads, - 1 TR thread (10 ms period) which places 350 KB blocks in a fifo (1 block every 10 ms). - 1 non-TR thread (SCHED_OTHER) which reads the block in the fifo and writes it to the disk If I run this on a powerful machine (HP Z4-i9, 14 cores, NVME disk, CentOS 7 with 3.10 PREEMPT_RT kernel, yes that's ooold), the max jitter WITH hackbench remains around 20 to 30 µs while the max jitter WITHOUT hackbench goes up to 350 µs! -> hackbench -p -g 20 -l 10000000 Running the program with taskset 01 doesn't change anything If I don't write the data to disk it doesn't change anything either. The important jitters appear rather at the beginning (but sometimes also later). Any ideas ? thanks by advance -- Pierre
