Hello, We are trying to optimize performance with i5 , 4 cores. We saw some strange behavior when using stress on all cores: "Sometimes" when testing performance with cyclictest we see that average on each core to ~20usec. Then, when we start stress on all 4 cores, it gets down to ~2usec. The weird thing is that it is not consistent. Most of the time, we see same behavior in both stress and without stress, of 2usec average. And suddenly in next boot it gets the "weird" performance. We are not yet sure, what happens in boot that gets this behavior. The maximum is kept the same all the time: ~35usec We are also trying to optimize the jitter, below 35usec. We tried the following: 1. use only idle mode (disable power states) 2. disable frequency save 3. isolating cpu. Yet, we still get the same ~35usec, using all this trials. Do you think it worth to try to use the latest rt kernel (4.9) ? Currently we use kernel 4.4 (with ubuntu 16.04). Best Regards, Ran -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
