Hi! 在 2024/04/22 11:33, 周泰宇 写道:
What I want to do here was to set an easy to reach value to BPS_LIMIT (10M/s in this example) and an unable to reach value to IOPS_LIMIT (100000 in this example). Under this setting, the iostat shows that the bps is far less than 10M/s and sometimes is far larger than 10M/s.
Yes, I know this behaviour, and this is because blk-throttle works before IO split, and io stats is accounting bps for rq-based disk after IO split, if you using Q2C for bps you'll see that bps is stable as limit. Hi, Tejun！ Do you think this *phenomenon* need to be fixed? If so, I don't see a easy way other than throttle bio after *IO split*. Perhaps ohter than bio merge case, this can be another motivation to move blk-throttle to rq_qos_throttle(). Thanks, Kuai
