Hello, We're seeing unexpected CFS throttling. I wrote down detailed description with an easily reproducible case here:
* https://gist.github.com/bobrik/2030ff040fad360327a5fab7a09c4ff1 TL;DR is that even though we don't burn through CFS quota during the period, throttling kicks in anyways. The larger interval between wakes up is, the higher chance of throttling we get. We're seeing this on different kernels (4.4, 4.9, 4.14) and different distros (different kernel configs). In corner cases well behaved applications that stay within quota get delayed for two periods in a row, which means 200ms latency with systemd.
