Lines Matching +full:throttle +full:- +full:period +full:- +full:us
1 .\" SPDX-License-Identifier: CDDL-1.0
11 .\" usr/src/OPENSOLARIS.LICENSE or https://opensource.org/licenses/CDDL-1.0.
31 .Bl -tag -width Ds
98 Turbo L2ARC warm-up.
175 Percent of ARC size allowed for L2ARC-only headers.
248 of a top-level vdev before moving on to the next top-level vdev.
251 Enable metaslab groups biasing based on their over- or under-utilization
260 Setting to 1 equals to 2 if the pool is write-bound or 0 otherwise.
313 if not page-aligned instead of silently falling back to uncached I/O.
316 When attempting to log an output nvlist of an ioctl in the on-disk history,
321 .Fn zfs_ioc_channel_program Pq cf. Xr zfs-program 8 .
327 Enable/disable segment-based metaslab selection.
330 When using segment-based metaslab selection, continue allocating
349 becomes the performance limiting factor on high-performance storage.
393 .Bl -item -compact
401 If that fails then we will have a multi-layer gang block.
404 .Bl -item -compact
414 If that fails then we will have a multi-layer gang block.
424 When a vdev is added, target this number of metaslabs per top-level vdev.
433 Maximum ashift used when optimizing for logical \[->] physical sector size on
435 top-level vdevs.
441 If non-zero, then a Direct I/O write's checksum will be verified every
461 Minimum ashift used when creating new top-level vdevs.
464 Minimum number of metaslabs to create in a top-level vdev.
472 Practical upper limit of total metaslabs per top-level vdev.
506 Max amount of memory to use for RAID-Z expansion I/O.
510 For testing, pause RAID-Z expansion when reflow amount reaches this value.
513 For expanded RAID-Z, aggregate reads that have more rows than this.
555 If this parameter is unset, the traversal skips non-metadata blocks.
557 import has started to stop or start the traversal of non-metadata blocks.
579 It also limits the worst-case time to allocate space.
599 Limits the number of on-disk error log entries that will be converted to the
610 A number of disks in a RAID-Z or dRAID vdev may sit out at the same time, up
614 Defaults to 600 seconds and a value of zero disables disk sit-outs in general,
618 How often each RAID-Z and dRAID vdev will check for slow disk outliers.
626 When performing slow outlier checks for RAID-Z and dRAID vdevs, this value is
632 problems, but may significantly increase the rate of spurious sit-outs.
635 of the inter-quartile range (IQR) that is being used in a Tukey's Fence
637 This is much higher than a normal Tukey's Fence k-value, because the
638 distribution under consideration is probably an extreme-value distribution,
642 During top-level vdev removal, chunks of data are copied from the vdev
653 Logical ashift for file-based devices.
656 Physical ashift for file-based devices.
711 .It Sy zfs_abd_scatter_max_order Ns = Ns Sy MAX_ORDER\-1 Pq uint
720 This is the minimum allocation size that will use scatter (page-based) ABDs.
725 bytes, try to unpin some of it in response to demand for non-metadata.
739 Percentage of ARC dnodes to try to scan in response to demand for non-metadata
747 with 8-byte pointers.
770 Number ARC headers to evict per sub-list before proceeding to another sub-list.
771 This batch-style operation prevents entire sub-lists from being evicted at once
779 Each thread will process one sub-list at a time,
780 until the eviction target is reached or all sub-lists have been processed.
786 CPUs Threads
788 1-4 1
789 5-8 2
790 9-15 3
791 16-31 4
792 32-63 6
793 64-95 8
794 96-127 9
795 128-160 11
796 160-191 12
797 192-223 13
798 224-255 14
819 Throttle I/O when free system memory drops below this percentage of total
823 will disable the throttle.
831 .Sy all_system_memory No \- Sy 1 GiB
873 Number of missing top-level vdevs which will be allowed during
874 pool import (only in read-only mode).
886 .Pa zfs-dbgmsg
891 equivalent to a quarter of the user-wired memory limit under
898 To allow more fine-grained locking, each ARC state contains a series
900 Locking is performed at the level of these "sub-lists".
901 This parameters controls the number of sub-lists per ARC state,
956 Note that in practice, the kernel's shrinker can ask us to evict
998 Intended for use with the test suite to throttle vdev removal speed.
1014 bytes on-disk.
1019 Only attempt to condense indirect vdev mappings if the on-disk size
1076 .Bl -tag -compact -offset 4n -width "continue"
1082 Attempt to recover from a "hung" operation by re-dispatching it
1086 This can be used to facilitate automatic fail-over
1087 to a properly configured fail-over partner.
1106 Enable prefetching dedup-ed blocks which are going to be freed.
1163 Enabling it will reduce worst-case import times, at the cost of increased TXG
1188 OpenZFS will spend no more than this much memory on maintaining the in-memory
1231 OpenZFS pre-release versions and now have compatibility issues.
1242 are not created per-object and instead a hashtable is used where collisions
1251 Upper-bound limit for unflushed metadata changes to be held by the
1269 This tunable is important because it involves a trade-off between import
1275 there will be more log spacemap blocks for us to read, inducing overhead
1298 It effectively limits maximum number of unflushed per-TXG spacemap logs
1346 for 32-bit systems.
1378 The upper limit of write-transaction ZIL log data size in bytes.
1390 Since ZFS is a copy-on-write filesystem with snapshots, blocks cannot be
1423 results in the original CPU-based calculation being used.
1581 For non-interactive I/O (scrub, resilver, removal, initialize and rebuild),
1582 the number of concurrently-active I/O operations is limited to
1590 and the number of concurrently-active non-interactive operations is increased to
1601 To prevent non-interactive I/O, like scrub,
1611 The following options may be bitwise-ored together:
1653 The following flags may be bitwise-ored together:
1666 256 ZFS_DEBUG_METASLAB_VERIFY Verify space accounting on disk matches in-memory \fBrange_trees\fP.
1673 16384 ZFS_DEBUG_BRT Enable BRT-related debugging messages.
1675 65536 ZFS_DEBUG_DDT Enable DDT-related debugging messages.
1703 from the error-encountering filesystem is "temporarily leaked".
1717 .Bl -enum -compact -offset 4n -width "1."
1720 e.g. due to a top-level vdev going offline), or
1766 .Xr zpool-initialize 8 .
1770 .Xr zpool-initialize 8 .
1774 The threshold size (in block pointers) at which we create a new sub-livelist.
1782 This is in place because livelists no long give us a benefit
1886 Setting the threshold to a non-zero percentage will stop allocations
1912 The multihost write period is
1913 .Sy zfs_multihost_interval No / Sy leaf-vdevs .
1918 In practice, the observed period can vary with the I/O load
1973 if a volatile out-of-order write cache is enabled.
1976 Allow no-operation writes.
1993 The number of blocks pointed by indirect (non-L0) block which should be
2001 .Sy 0 No disables this throttle .
2022 Disable QAT hardware acceleration for AES-GCM encryption.
2038 top-level vdev.
2139 .Bl -tag -compact -offset 4n -width "a"
2146 The largest mostly-contiguous chunk of found data will be verified first.
2167 .It Sy zfs_scan_mem_lim_fact Ns = Ns Sy 20 Ns ^-1 Pq uint
2174 .It Sy zfs_scan_mem_lim_soft_fact Ns = Ns Sy 20 Ns ^-1 Pq uint
2209 Including unmodified copies of the spill blocks creates a backwards-compatible
2212 .It Sy zfs_send_no_prefetch_queue_ff Ns = Ns Sy 20 Ns ^\-1 Pq uint
2223 .It Sy zfs_send_queue_ff Ns = Ns Sy 20 Ns ^\-1 Pq uint
2234 .It Sy zfs_recv_queue_ff Ns = Ns Sy 20 Ns ^\-1 Pq uint
2256 When this variable is set to non-zero a corrective receive:
2257 .Bl -enum -compact -offset 4n -width "1."
2314 many blocks' size will change, and thus we have to re-allocate
2344 This option is useful for pools constructed from large thinly-provisioned
2360 This setting represents a trade-off between issuing larger,
2384 Max vdev I/O aggregation size for non-rotating media.
2407 the purpose of selecting the least busy mirror member on non-rotational vdevs
2420 Aggregate read I/O operations if the on-disk gap between them is within this
2424 Aggregate write I/O operations if the on-disk gap between them is within this
2430 Variants that don't depend on CPU-specific features
2443 fastest selected by built-in benchmark
2446 sse2 SSE2 instruction set 64-bit x86
2447 ssse3 SSSE3 instruction set 64-bit x86
2448 avx2 AVX2 instruction set 64-bit x86
2449 avx512f AVX512F instruction set 64-bit x86
2450 avx512bw AVX512F & AVX512BW instruction sets 64-bit x86
2451 aarch64_neon NEON Aarch64/64-bit ARMv8
2452 aarch64_neonx2 NEON with more unrolling Aarch64/64-bit ARMv8
2459 .Xr zpool-events 8 .
2476 The number of taskq entries that are pre-populated when the taskq is first
2501 if a volatile out-of-order write cache is enabled.
2533 using LZ4 and zstd-1 passes is enabled.
2540 If non-zero, the zio deadman will produce debugging messages
2556 Throttle block allocations in the I/O pipeline.
2593 infrequently-accessed files, until the kernel's memory pressure mechanism
2650 generate a system-dependent value close to 6 threads per taskq.
2703 .Pq Li blk-mq .
2723 .Li blk-mq
2735 .Li blk-mq
2743 .Li blk-mq
2750 .Sy volblocksize Ns -sized blocks per zvol thread.
2758 .Li blk-mq
2763 .Li blk-mq
2766 .Li blk-mq
2780 .Bl -tag -compact -offset 4n -width "a"
2804 Note that the sum of the per-queue minima must not exceed the aggregate maximum.
2805 If the sum of the per-queue maxima exceeds the aggregate maximum,
2809 regardless of whether all per-queue minima have been met.
2863 follows a piece-wise linear function defined by a few adjustable points:
2864 .Bd -literal
2865 | o---------| <-- \fBzfs_vdev_async_write_max_active\fP
2872 |-------o | | <-- \fBzfs_vdev_async_write_min_active\fP
2876 | `-- \fBzfs_vdev_async_write_active_max_dirty_percent\fP
2877 `--------- \fBzfs_vdev_async_write_active_min_dirty_percent\fP
2895 In this case, we must further throttle incoming writes,
2913 .D1 min_time = min( Ns Sy zfs_delay_scale No \(mu Po Sy dirty No \- Sy min Pc / Po Sy max No \- Sy …
2926 .Bd -literal
2928 10ms +-------------------------------------------------------------*+
2947 | \fBzfs_delay_scale\fP ----------> ******** |
2948 0 +-------------------------------------*********----------------+
2949 0% <- \fBzfs_dirty_data_max\fP -> 100%
2955 .Em 500 us
2965 .Bd -literal
2967 100ms +-------------------------------------------------------------++
2976 + \fBzfs_delay_scale\fP ----------> ***** +
2979 100us + ** +
2983 10us + * +
2987 +--------------------------------------------------------------+
2988 0% <- \fBzfs_dirty_data_max\fP -> 100%
2995 for the I/O scheduler to reach optimal throughput on the back-end storage,