CONFIG_SCSI_NCR53C8XX_MAX_TAGS: maximum number of queued commands

General informations

The Linux kernel configuration item CONFIG_SCSI_NCR53C8XX_MAX_TAGS has multiple definitions:

maximum number of queued commands found in drivers/scsi/Kconfig

The configuration item CONFIG_SCSI_NCR53C8XX_MAX_TAGS:

• prompt: maximum number of queued commands
• type: int
• depends on: CONFIG_SCSI_ZALON
• defined in drivers/scsi/Kconfig
• found in Linux kernels: 2.5.45–2.5.73, 2.6.18–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

This option allows you to specify the maximum number of commands that can be queued to any device, when tagged command queuing is possible. The default value is 32. Minimum is 2, maximum is 64. Modern hard disks are able to support 64 tags and even more, but do not seem to be faster when more than 32 tags are being used.

So, the normal answer here is to go with the default value 32 unless you are using very large hard disks with large cache (>= 1 MB) that are able to take advantage of more than 32 tagged commands.

There is no safe option and the default answer is recommended.

maximum number of queued commands found in drivers/scsi/Kconfig

The configuration item CONFIG_SCSI_NCR53C8XX_MAX_TAGS:

• prompt: maximum number of queued commands
• type: int
• depends on: CONFIG_SCSI_ZALON || CONFIG_SCSI_NCR_Q720
• defined in drivers/scsi/Kconfig
• found in Linux kernels: 2.5.74–2.5.75, 2.6.0–2.6.17

Help text

This option allows you to specify the maximum number of commands that can be queued to any device, when tagged command queuing is possible. The default value is 32. Minimum is 2, maximum is 64. Modern hard disks are able to support 64 tags and even more, but do not seem to be faster when more than 32 tags are being used.

So, the normal answer here is to go with the default value 32 unless you are using very large hard disks with large cache (>= 1 MB) that are able to take advantage of more than 32 tagged commands.

There is no safe option and the default answer is recommended.

maximum number of queued commands found in arch/sparc64/Kconfig

The configuration item CONFIG_SCSI_NCR53C8XX_MAX_TAGS:

• prompt: maximum number of queued commands
• type: int
• depends on: CONFIG_PCI && CONFIG_SCSI_SYM53C8XX_2 != CONFIG_y && ( CONFIG_SCSI_NCR53C8XX || CONFIG_SCSI_SYM53C8XX )
• defined in arch/sparc64/Kconfig
• found in Linux kernels: 2.5.45–2.5.72

Help text

This option allows you to specify the maximum number of commands that can be queued to any device, when tagged command queuing is possible. The default value is 32. Minimum is 2, maximum is 64. Modern hard disks are able to support 64 tags and even more, but do not seem to be faster when more than 32 tags are being used.

So, the normal answer here is to go with the default value 32 unless you are using very large hard disks with large cache (>= 1 MB) that are able to take advantage of more than 32 tagged commands.

There is no safe option and the default answer is recommended.

maximum number of queued commands found in arch/parisc/Kconfig

The configuration item CONFIG_SCSI_NCR53C8XX_MAX_TAGS:

• prompt: maximum number of queued commands
• type: int
• depends on: CONFIG_SCSI_ZALON || CONFIG_SCSI_SYM53C8XX
• defined in arch/parisc/Kconfig
• found in Linux kernels: 2.5.45

Help text

This option allows you to specify the maximum number of commands that can be queued to any device, when tagged command queuing is possible. The default value is 32. Minimum is 2, maximum is 64. Modern hard disks are able to support 64 tags and even more, but do not seem to be faster when more than 32 tags are being used.

So, the normal answer here is to go with the default value 32 unless you are using very large hard disks with large cache (>= 1 MB) that are able to take advantage of more than 32 tagged commands.

There is no safe option and the default answer is recommended.

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The data is retrived from:

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