Gustavo Noronha Silva 6b8e90545e Apply known iocost solutions to block devices ... Meta's resource control demo project[0] includes a benchmark tool that can be used to calculate the best iocost solutions for a given SSD. [0]: https://github.com/facebookexperimental/resctl-demo A project[1] has now been started to create a publicly available database of results that can be used to apply them automatically. [1]: https://github.com/iocost-benchmark/iocost-benchmarks This change adds a new tool that gets triggered by a udev rule for any block device and queries the hwdb for known solutions. The format for the hwdb file that is currently generated by the github action looks like this: # This file was auto-generated on Tue, 23 Aug 2022 13:03:57 +0000. # From the following commit: # ca82acfe93 # # Match key format: # block:<devpath>:name:<model name>: # 12 points, MOF=[1.346,1.346], aMOF=[1.249,1.249] block:*:name:HFS256GD9TNG-62A0A:fwver:*: IOCOST_SOLUTIONS=isolation isolated-bandwidth bandwidth naive IOCOST_MODEL_ISOLATION=rbps=1091439492 rseqiops=52286 rrandiops=63784 wbps=192329466 wseqiops=12309 wrandiops=16119 IOCOST_QOS_ISOLATION=rpct=0.00 rlat=8807 wpct=0.00 wlat=59023 min=100.00 max=100.00 IOCOST_MODEL_ISOLATED_BANDWIDTH=rbps=1091439492 rseqiops=52286 rrandiops=63784 wbps=192329466 wseqiops=12309 wrandiops=16119 IOCOST_QOS_ISOLATED_BANDWIDTH=rpct=0.00 rlat=8807 wpct=0.00 wlat=59023 min=100.00 max=100.00 IOCOST_MODEL_BANDWIDTH=rbps=1091439492 rseqiops=52286 rrandiops=63784 wbps=192329466 wseqiops=12309 wrandiops=16119 IOCOST_QOS_BANDWIDTH=rpct=0.00 rlat=8807 wpct=0.00 wlat=59023 min=100.00 max=100.00 IOCOST_MODEL_NAIVE=rbps=1091439492 rseqiops=52286 rrandiops=63784 wbps=192329466 wseqiops=12309 wrandiops=16119 IOCOST_QOS_NAIVE=rpct=99.00 rlat=8807 wpct=99.00 wlat=59023 min=75.00 max=100.00 The IOCOST_SOLUTIONS key lists the solutions available for that device in the preferred order for higher isolation, which is a reasonable default for most client systems. This can be overriden to choose better defaults for custom use cases, like the various data center workloads. The tool can also be used to query the known solutions for a specific device or to apply a non-default solution (say, isolation or bandwidth). Co-authored-by: Santosh Mahto <santosh.mahto@collabora.com>		2023-04-20 16:45:57 +02:00
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meson.build	Apply known iocost solutions to block devices	2023-04-20 16:45:57 +02:00