Cap storage hw queue count to 4#40975
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Pull request overview
Caps the Linux kernel storage driver hardware queue count (hv_storvsc.storvsc_max_hw_queues) for WSL’s HCS-based VM instances to reduce VM memory overhead on high-core-count machines, by appending the appropriate kernel command-line argument when CPU count exceeds a threshold.
Changes:
- Introduces a
MAX_STORAGE_HW_QUEUESconstant (set to 4). - Appends
hv_storvsc.storvsc_max_hw_queues=4to the VM kernel command line whenSettings->CpuCount > 4.
chemwolf6922
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benhillis
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Jul 2, 2026
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Can you please clarify what the labels on the X and Y axis of the above graph represent? |
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Graph updated. The X axis is the VM CPU count. The Y axis is the ram overhead measured with wsl-benchmarking. |
chemwolf6922
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Summary of the Pull Request
Cap the hv_storvsc.storvsc_max_hw_queues to 4 to reduce memory overhead on CPUs with high core counts.
PR Checklist
Detailed Description of the Pull Request / Additional comments
Validation Steps Performed
Test platform
CPU: 13900, 32 logical cores.
Drive backing the vhd: WDC SN810 1T
RAM overhead comparison
RAM overhead measured with wsl-benchmarking. VM RAM = 2G, vhd size = 100G. Noise (std) ~= 5 - 10
IO performance comparison
IO performance measured with fio-bench. --numjobs = 32. VM CPU count = 32.