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Make more taskq parameters writable #16118

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Apr 24, 2024
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Make more taskq parameters writable #16118

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9 changes: 7 additions & 2 deletions man/man4/zfs.4
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Original file line number Diff line number Diff line change
Expand Up @@ -2327,15 +2327,16 @@ Prioritize requeued I/O.
.
.It Sy zio_taskq_batch_pct Ns = Ns Sy 80 Ns % Pq uint
Percentage of online CPUs which will run a worker thread for I/O.
These workers are responsible for I/O work such as compression and
checksum calculations.
These workers are responsible for I/O work such as compression, encryption,
checksum and parity calculations.
Fractional number of CPUs will be rounded down.
.Pp
The default value of
.Sy 80%
was chosen to avoid using all CPUs which can result in
latency issues and inconsistent application performance,
especially when slower compression and/or checksumming is enabled.
Set value only applies to pools imported/created after that.
.
.It Sy zio_taskq_batch_tpq Ns = Ns Sy 0 Pq uint
Number of worker threads per taskq.
Expand All @@ -2345,6 +2346,7 @@ while higher reduces lock contention.
If
.Sy 0 ,
generate a system-dependent value close to 6 threads per taskq.
Set value only applies to pools imported/created after that.
.
.It Sy zio_taskq_wr_iss_ncpus Ns = Ns Sy 0 Pq uint
Determines the number of CPUs to run write issue taskqs.
Expand All @@ -2353,16 +2355,19 @@ When 0 (the default), the value to use is computed internally
as the number of actual CPUs in the system divided by the
.Sy spa_num_allocators
value.
Set value only applies to pools imported/created after that.
.
.It Sy zio_taskq_read Ns = Ns Sy fixed,1,8 null scale null Pq charp
Set the queue and thread configuration for the IO read queues.
This is an advanced debugging parameter.
Don't change this unless you understand what it does.
Set values only apply to pools imported/created after that.
.
.It Sy zio_taskq_write Ns = Ns Sy sync fixed,1,5 scale fixed,1,5 Pq charp
Set the queue and thread configuration for the IO write queues.
This is an advanced debugging parameter.
Don't change this unless you understand what it does.
Set values only apply to pools imported/created after that.
.
.It Sy zvol_inhibit_dev Ns = Ns Sy 0 Ns | Ns 1 Pq uint
Do not create zvol device nodes.
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8 changes: 4 additions & 4 deletions module/zfs/spa.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10789,10 +10789,10 @@ ZFS_MODULE_PARAM(zfs_spa, spa_, load_verify_data, INT, ZMOD_RW,
ZFS_MODULE_PARAM(zfs_spa, spa_, load_print_vdev_tree, INT, ZMOD_RW,
"Print vdev tree to zfs_dbgmsg during pool import");

ZFS_MODULE_PARAM(zfs_zio, zio_, taskq_batch_pct, UINT, ZMOD_RD,
ZFS_MODULE_PARAM(zfs_zio, zio_, taskq_batch_pct, UINT, ZMOD_RW,
"Percentage of CPUs to run an IO worker thread");

ZFS_MODULE_PARAM(zfs_zio, zio_, taskq_batch_tpq, UINT, ZMOD_RD,
ZFS_MODULE_PARAM(zfs_zio, zio_, taskq_batch_tpq, UINT, ZMOD_RW,
"Number of threads per IO worker taskqueue");

/* BEGIN CSTYLED */
Expand Down Expand Up @@ -10823,10 +10823,10 @@ ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, new_alloc, INT,

#ifdef _KERNEL
ZFS_MODULE_VIRTUAL_PARAM_CALL(zfs_zio, zio_, taskq_read,
spa_taskq_read_param_set, spa_taskq_read_param_get, ZMOD_RD,
spa_taskq_read_param_set, spa_taskq_read_param_get, ZMOD_RW,
"Configure IO queues for read IO");
ZFS_MODULE_VIRTUAL_PARAM_CALL(zfs_zio, zio_, taskq_write,
spa_taskq_write_param_set, spa_taskq_write_param_get, ZMOD_RD,
spa_taskq_write_param_set, spa_taskq_write_param_get, ZMOD_RW,
"Configure IO queues for write IO");
#endif
/* END CSTYLED */
Expand Down
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