CONFIG_MMC_BLOCK_BOUNCE: Use bounce buffer for simple hosts

General informations

The Linux kernel configuration item CONFIG_MMC_BLOCK_BOUNCE has multiple definitions:

Use bounce buffer for simple hosts found in drivers/mmc/core/Kconfig

The configuration item CONFIG_MMC_BLOCK_BOUNCE:

• prompt: Use bounce buffer for simple hosts
• type: bool
• depends on: CONFIG_MMC_BLOCK
• defined in drivers/mmc/core/Kconfig
• found in Linux kernels: 4.10–4.12

Help text

SD/MMC is a high latency protocol where it is crucial to send large requests in order to get high performance. Many controllers, however, are restricted to continuous memory (i.e. they can't do scatter-gather), something the kernel rarely can provide.

Say Y here to help these restricted hosts by bouncing requests back and forth from a large buffer. You will get a big performance gain at the cost of up to 64 KiB of physical memory.

If unsure, say Y here.

Use bounce buffer for simple hosts found in drivers/mmc/card/Kconfig

The configuration item CONFIG_MMC_BLOCK_BOUNCE:

• prompt: Use bounce buffer for simple hosts
• type: bool
• depends on: CONFIG_MMC_BLOCK
• defined in drivers/mmc/card/Kconfig
• found in Linux kernels: 2.6.23–2.6.39, 3.0–3.19, 4.0–4.9

Help text

SD/MMC is a high latency protocol where it is crucial to send large requests in order to get high performance. Many controllers, however, are restricted to continuous memory (i.e. they can't do scatter-gather), something the kernel rarely can provide.

Say Y here to help these restricted hosts by bouncing requests back and forth from a large buffer. You will get a big performance gain at the cost of up to 64 KiB of physical memory.

If unsure, say Y here.

Hardware

LKDDb

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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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