Add prefetch property #15436
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Add prefetch property #15436
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ZFS prefetch is currently governed by the zfs_prefetch_disable tunable. However, this is a module-wide settings - if a specific dataset benefits from prefetch, while others have issue with it, an optimal solution does not exists. This commit introduce the "prefetch" tri-state property, which enable granular control (at dataset/volume level) for prefetching. This patch does not remove the zfs_prefetch_disable, which reimains a system-wide switch for enable/disable prefetch. However, to avoid duplication, it would be preferable to deprecate and then remove the module tunable. Signed-off-by: Gionatan Danti <[email protected]>
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amotin
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Oct 23, 2023
behlendorf
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Status: Accepted
lundman
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ZFS prefetch is currently governed by the zfs_prefetch_disable tunable. However, this is a module-wide settings - if a specific dataset benefits from prefetch, while others have issue with it, an optimal solution does not exists. This commit introduce the "prefetch" tri-state property, which enable granular control (at dataset/volume level) for prefetching. This patch does not remove the zfs_prefetch_disable, which remains a system-wide switch for enable/disable prefetch. However, to avoid duplication, it would be preferable to deprecate and then remove the module tunable. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Ameer Hamza <[email protected]> Signed-off-by: Gionatan Danti <[email protected]> Co-authored-by: Gionatan Danti <[email protected]> Closes openzfs#15237 Closes openzfs#15436
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ZFS prefetch is currently governed by the zfs_prefetch_disable tunable. However, this is a module-wide settings - if a specific dataset benefits from prefetch, while others have issue with it, an optimal solution does not exists. This commit introduce the "prefetch" tri-state property, which enable granular control (at dataset/volume level) for prefetching. This patch does not remove the zfs_prefetch_disable, which remains a system-wide switch for enable/disable prefetch. However, to avoid duplication, it would be preferable to deprecate and then remove the module tunable. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Ameer Hamza <[email protected]> Signed-off-by: Gionatan Danti <[email protected]> Co-authored-by: Gionatan Danti <[email protected]> Closes #15237 Closes #15436
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Motivation and Context
Original PR #15237 thanks to @shodanshok . Moved to its own branch and rebased on master to get another test run.
Description
ZFS prefetch is currently governed by the zfs_prefetch_disable tunable. However, this is a module-wide settings - if a specific dataset benefits from prefetch, while others have issue with it, an optimal solution does not exists.
This commit introduce the "prefetch" tri-state property, which enable granular control (at dataset/volume level) for prefetching.
This patch does not remove the zfs_prefetch_disable, which reimains a system-wide switch for enable/disable prefetch. However, to avoid duplication, it would be preferable to deprecate and then remove the module tunable.
Types of changes
Checklist:
Signed-off-by.