> From: Huisong Li [mailto:lihuis...@huawei.com] > Sent: Wednesday, 20 March 2024 11.55 > > The system-wide CPU latency QoS limit has a positive impact on the idle > state selection in cpuidle governor. > > Linux creates a cpu_dma_latency device under '/dev' directory to obtain the > CPU latency QoS limit on system and send the QoS request for userspace. > Please see the PM QoS framework in the following link: > https://docs.kernel.org/power/pm_qos_interface.html?highlight=qos > This feature is supported by kernel-v2.6.25. > > The deeper the idle state, the lower the power consumption, but the longer > the resume time. Some service are delay sensitive and very except the low > resume time, like interrupt packet receiving mode. > > So this series introduce PM QoS interface.
This looks like a 1:1 wrapper for a Linux kernel feature. Does Windows or BSD offer something similar? Furthermore, any high-res timing should use nanoseconds, not microseconds or milliseconds. I realize that the Linux kernel only uses microseconds for these APIs, but the DPDK API should use nanoseconds.
