CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS: Number of storage pipeline buffers

General informations

The Linux kernel configuration item CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS:

• prompt: Number of storage pipeline buffers
• type: int
• depends on: (none)
• defined in drivers/usb/gadget/Kconfig
• found in Linux kernels: 3.2–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Usually 2 buffers are enough to establish a good buffering pipeline. The number may be increased in order to compensate for a bursty VFS behaviour. For instance there may be CPU wake up latencies that makes the VFS to appear bursty in a system with an CPU on-demand governor. Especially if DMA is doing IO to offload the CPU. In this case the CPU will go into power save often and spin up occasionally to move data within VFS. If selecting USB_GADGET_DEBUG_FILES this value may be set by a module parameter as well. If unsure, say 2.

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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