SSV-25461 High latency due to ZFSin driver#111
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datacore-PankajSharma merged 18 commits intoMay 22, 2026
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Registry 'zfs_abd_prealloc_percent' can be used to set the percent of prealloc wrt zfs_arc_max
…oc_percent Setting zfs_prealloc_percent=0 will disable the prealloc feature
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* Added support to prealloc the abd cache * Registry 'zfs_abd_prealloc_percent' can be used to set the percent of prealloc wrt zfs_arc_max * Disabled memory pressure thread * Changed abd_cache alloc size * skip source free when the reserved memory is not crossing arc_max * skip source free when the reserved memory is not crossing arc_max * skip source free when the reserved memory is not crossing arc_max * Changed the registry name from zfs_abd_prealloc_percent to zfs_prealloc_percent Setting zfs_prealloc_percent=0 will disable the prealloc feature * Reverted zfs_abd_chunk_size from 65536 to 4096 which was causing read performace issue * Fix spl_thread_create not setting thread priority * Change memory available logic and manual pressure * Add dynamic zfs_dirty_data_max adjustments * Memory consumption crossing zfs_total_memory_limit * change spl_free_wrapper and spl_free_manual_pressure_wrapper logic for prealloc --------- Co-authored-by: Arun KV <arun.kv@datacore.com>
datacore-PankajSharma
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May 22, 2026
* Added support to prealloc the abd cache * Registry 'zfs_abd_prealloc_percent' can be used to set the percent of prealloc wrt zfs_arc_max * Disabled memory pressure thread * Changed abd_cache alloc size * skip source free when the reserved memory is not crossing arc_max * skip source free when the reserved memory is not crossing arc_max * skip source free when the reserved memory is not crossing arc_max * Changed the registry name from zfs_abd_prealloc_percent to zfs_prealloc_percent Setting zfs_prealloc_percent=0 will disable the prealloc feature * Reverted zfs_abd_chunk_size from 65536 to 4096 which was causing read performace issue * Fix spl_thread_create not setting thread priority * Change memory available logic and manual pressure * Add dynamic zfs_dirty_data_max adjustments * Memory consumption crossing zfs_total_memory_limit * change spl_free_wrapper and spl_free_manual_pressure_wrapper logic for prealloc --------- Co-authored-by: Arun KV <arun.kv@datacore.com>
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Motivation and Context
This change addresses the SSV-25461 ZFSin high latency issue after restart
Description
Here is the detailed list of changes that were added to address the issue
How Has This Been Tested?
Testing has been done in two phases
Types of changes
Checklist:
Signed-off-by.