QoS Handling with DVFS (CPUfreq & Devfreq) - The Linux Foundation

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Handling QoS Requests: How it WorksQoSRequester 1QoSRequester 2PM-QoSFrameworkDVFSFrameworkDVFSDriver (bus)DMA throughput> 1GB/sDMA throughput> 1.5GB/sDMA throughput> 1GB/sDMA throughput> 1.5GB/sDVFS thinks bus needs 400MHzDVFS thinks bus needs 133MHzBut QoS constraints at 266MHzDVFS f/w sets bus-min = 266Set Bus 266MHz266MHz is enough.No changes in bus-minSet Bus 400MHzSet Bus 266MHzDMA throughput> 0.5GB/s1.5 > 0.5. Don’t talk to DVFS f/wDMA throughput> 0GB/s (don’t care)DMA throughput> 0.5GB/sDVFS f/w sets bus-min = 166Set Bus 166MHz20Samsung Electronics
Handling QoS Requests: Status New Global QoS Metrics Required DMA-Throughput: use kbytes/sec? GPU Performance: ??? CPU Performance: ??? (BogoMIPS?? MIPS?? Clock?? …) QoS-Extension for CPUfreq Work-to-do: Handling global QoS (after we get the metric) QoS-Extension for Devfreq Done: Handling global QoS and per-dev QoS In-progress: test & evaluation 3.5/3.6 Materials?21Samsung Electronics
Page 3 and 4: Topics Introduction DVFS (Dynamic V
Page 5 and 6: Linux Kernel Power ManagementLinux
Page 7 and 8: Intro: DVFS 2/2 Sampling the utiliz
Page 9 and 10: Intro: Terms DVFS Target A device w
Page 11 and 12: Performance Issues of DVFS: 1/3 Iss
Page 13 and 14: Performance Issues of DVFS: 3/3 Iss
Page 15 and 16: The Possible Solution QoS handling
Page 17 and 18: QoS on DVFS Devices (DVFS f/w): Wor
Page 19: Handling QoS Requests: Design-After
Page 23 and 24: DVFS Response Latency: Motivation R
Page 26 and 27: DVFS Response Latency: DesignPM-QoS
Page 29 and 30: DVFS Response Latency: Status Used
Page 31 and 32: Conclusion - Future Work 1/3 What
Page 33 and 34: Conclusion - Future Work 3/3 Future
Page 35 and 36: Appendix35Samsung Electronics

QoS Handling with DVFS (CPUfreq & Devfreq) - The Linux Foundation

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