*/
/*
- * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <sys/zio.h>
#include <sys/avl.h>
#include <sys/dsl_pool.h>
+#include <sys/metaslab_impl.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/kstat.h>
+#include <sys/abd.h>
/*
* ZFS I/O Scheduler
uint32_t zfs_vdev_sync_write_max_active = 10;
uint32_t zfs_vdev_async_read_min_active = 1;
uint32_t zfs_vdev_async_read_max_active = 3;
-uint32_t zfs_vdev_async_write_min_active = 1;
+uint32_t zfs_vdev_async_write_min_active = 2;
uint32_t zfs_vdev_async_write_max_active = 10;
uint32_t zfs_vdev_scrub_min_active = 1;
uint32_t zfs_vdev_scrub_max_active = 2;
+uint32_t zfs_vdev_removal_min_active = 1;
+uint32_t zfs_vdev_removal_max_active = 2;
+uint32_t zfs_vdev_initializing_min_active = 1;
+uint32_t zfs_vdev_initializing_max_active = 1;
/*
* When the pool has less than zfs_vdev_async_write_active_min_dirty_percent
* we include spans of optional I/Os to aid aggregation at the disk even when
* they aren't able to help us aggregate at this level.
*/
-int zfs_vdev_aggregation_limit = SPA_OLD_MAXBLOCKSIZE;
+int zfs_vdev_aggregation_limit = 1 << 20;
int zfs_vdev_read_gap_limit = 32 << 10;
int zfs_vdev_write_gap_limit = 4 << 10;
+/*
+ * Define the queue depth percentage for each top-level. This percentage is
+ * used in conjunction with zfs_vdev_async_max_active to determine how many
+ * allocations a specific top-level vdev should handle. Once the queue depth
+ * reaches zfs_vdev_queue_depth_pct * zfs_vdev_async_write_max_active / 100
+ * then allocator will stop allocating blocks on that top-level device.
+ * The default kernel setting is 1000% which will yield 100 allocations per
+ * device. For userland testing, the default setting is 300% which equates
+ * to 30 allocations per device.
+ */
+#ifdef _KERNEL
+int zfs_vdev_queue_depth_pct = 1000;
+#else
+int zfs_vdev_queue_depth_pct = 300;
+#endif
+
+/*
+ * When performing allocations for a given metaslab, we want to make sure that
+ * there are enough IOs to aggregate together to improve throughput. We want to
+ * ensure that there are at least 128k worth of IOs that can be aggregated, and
+ * we assume that the average allocation size is 4k, so we need the queue depth
+ * to be 32 per allocator to get good aggregation of sequential writes.
+ */
+int zfs_vdev_def_queue_depth = 32;
+
+
int
vdev_queue_offset_compare(const void *x1, const void *x2)
{
- const zio_t *z1 = x1;
- const zio_t *z2 = x2;
+ const zio_t *z1 = (const zio_t *)x1;
+ const zio_t *z2 = (const zio_t *)x2;
- if (z1->io_offset < z2->io_offset)
- return (-1);
- if (z1->io_offset > z2->io_offset)
- return (1);
+ int cmp = AVL_CMP(z1->io_offset, z2->io_offset);
- if (z1 < z2)
- return (-1);
- if (z1 > z2)
- return (1);
+ if (likely(cmp))
+ return (cmp);
- return (0);
+ return (AVL_PCMP(z1, z2));
}
static inline avl_tree_t *
int
vdev_queue_timestamp_compare(const void *x1, const void *x2)
{
- const zio_t *z1 = x1;
- const zio_t *z2 = x2;
+ const zio_t *z1 = (const zio_t *)x1;
+ const zio_t *z2 = (const zio_t *)x2;
- if (z1->io_timestamp < z2->io_timestamp)
- return (-1);
- if (z1->io_timestamp > z2->io_timestamp)
- return (1);
+ int cmp = AVL_CMP(z1->io_timestamp, z2->io_timestamp);
- if (z1 < z2)
- return (-1);
- if (z1 > z2)
- return (1);
+ if (likely(cmp))
+ return (cmp);
- return (0);
+ return (AVL_PCMP(z1, z2));
}
static int
return (zfs_vdev_async_write_min_active);
case ZIO_PRIORITY_SCRUB:
return (zfs_vdev_scrub_min_active);
+ case ZIO_PRIORITY_REMOVAL:
+ return (zfs_vdev_removal_min_active);
+ case ZIO_PRIORITY_INITIALIZING:
+ return (zfs_vdev_initializing_min_active);
default:
panic("invalid priority %u", p);
return (0);
vdev_queue_max_async_writes(spa_t *spa)
{
int writes;
- uint64_t dirty = spa->spa_dsl_pool->dp_dirty_total;
+ uint64_t dirty = 0;
+ dsl_pool_t *dp = spa_get_dsl(spa);
uint64_t min_bytes = zfs_dirty_data_max *
zfs_vdev_async_write_active_min_dirty_percent / 100;
uint64_t max_bytes = zfs_dirty_data_max *
zfs_vdev_async_write_active_max_dirty_percent / 100;
+ /*
+ * Async writes may occur before the assignment of the spa's
+ * dsl_pool_t if a self-healing zio is issued prior to the
+ * completion of dmu_objset_open_impl().
+ */
+ if (dp == NULL)
+ return (zfs_vdev_async_write_max_active);
+
/*
* Sync tasks correspond to interactive user actions. To reduce the
* execution time of those actions we push data out as fast as possible.
*/
- if (spa_has_pending_synctask(spa)) {
+ if (spa_has_pending_synctask(spa))
return (zfs_vdev_async_write_max_active);
- }
+ dirty = dp->dp_dirty_total;
if (dirty < min_bytes)
return (zfs_vdev_async_write_min_active);
if (dirty > max_bytes)
return (vdev_queue_max_async_writes(spa));
case ZIO_PRIORITY_SCRUB:
return (zfs_vdev_scrub_max_active);
+ case ZIO_PRIORITY_REMOVAL:
+ return (zfs_vdev_removal_max_active);
+ case ZIO_PRIORITY_INITIALIZING:
+ return (zfs_vdev_initializing_max_active);
default:
panic("invalid priority %u", p);
return (0);
avl_create(&vq->vq_active_tree, vdev_queue_offset_compare,
sizeof (zio_t), offsetof(struct zio, io_queue_node));
avl_create(vdev_queue_type_tree(vq, ZIO_TYPE_READ),
- vdev_queue_offset_compare, sizeof (zio_t),
- offsetof(struct zio, io_offset_node));
+ vdev_queue_offset_compare, sizeof (zio_t),
+ offsetof(struct zio, io_offset_node));
avl_create(vdev_queue_type_tree(vq, ZIO_TYPE_WRITE),
- vdev_queue_offset_compare, sizeof (zio_t),
- offsetof(struct zio, io_offset_node));
+ vdev_queue_offset_compare, sizeof (zio_t),
+ offsetof(struct zio, io_offset_node));
for (p = 0; p < ZIO_PRIORITY_NUM_QUEUEABLE; p++) {
int (*compfn) (const void *, const void *);
else
compfn = vdev_queue_offset_compare;
avl_create(vdev_queue_class_tree(vq, p), compfn,
- sizeof (zio_t), offsetof(struct zio, io_queue_node));
+ sizeof (zio_t), offsetof(struct zio, io_queue_node));
}
+
+ vq->vq_last_offset = 0;
}
void
vdev_queue_fini(vdev_t *vd)
{
vdev_queue_t *vq = &vd->vdev_queue;
- zio_priority_t p;
- for (p = 0; p < ZIO_PRIORITY_NUM_QUEUEABLE; p++)
+ for (zio_priority_t p = 0; p < ZIO_PRIORITY_NUM_QUEUEABLE; p++)
avl_destroy(vdev_queue_class_tree(vq, p));
avl_destroy(&vq->vq_active_tree);
avl_destroy(vdev_queue_type_tree(vq, ZIO_TYPE_READ));
vdev_queue_io_add(vdev_queue_t *vq, zio_t *zio)
{
spa_t *spa = zio->io_spa;
- spa_stats_history_t *ssh = &spa->spa_stats.io_history;
+ spa_history_kstat_t *shk = &spa->spa_stats.io_history;
ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
avl_add(vdev_queue_class_tree(vq, zio->io_priority), zio);
avl_add(vdev_queue_type_tree(vq, zio->io_type), zio);
- if (ssh->kstat != NULL) {
- mutex_enter(&ssh->lock);
- kstat_waitq_enter(ssh->kstat->ks_data);
- mutex_exit(&ssh->lock);
+ if (shk->kstat != NULL) {
+ mutex_enter(&shk->lock);
+ kstat_waitq_enter(shk->kstat->ks_data);
+ mutex_exit(&shk->lock);
}
}
vdev_queue_io_remove(vdev_queue_t *vq, zio_t *zio)
{
spa_t *spa = zio->io_spa;
- spa_stats_history_t *ssh = &spa->spa_stats.io_history;
+ spa_history_kstat_t *shk = &spa->spa_stats.io_history;
ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
avl_remove(vdev_queue_class_tree(vq, zio->io_priority), zio);
avl_remove(vdev_queue_type_tree(vq, zio->io_type), zio);
- if (ssh->kstat != NULL) {
- mutex_enter(&ssh->lock);
- kstat_waitq_exit(ssh->kstat->ks_data);
- mutex_exit(&ssh->lock);
+ if (shk->kstat != NULL) {
+ mutex_enter(&shk->lock);
+ kstat_waitq_exit(shk->kstat->ks_data);
+ mutex_exit(&shk->lock);
}
}
vdev_queue_pending_add(vdev_queue_t *vq, zio_t *zio)
{
spa_t *spa = zio->io_spa;
- spa_stats_history_t *ssh = &spa->spa_stats.io_history;
+ spa_history_kstat_t *shk = &spa->spa_stats.io_history;
ASSERT(MUTEX_HELD(&vq->vq_lock));
ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
vq->vq_class[zio->io_priority].vqc_active++;
avl_add(&vq->vq_active_tree, zio);
- if (ssh->kstat != NULL) {
- mutex_enter(&ssh->lock);
- kstat_runq_enter(ssh->kstat->ks_data);
- mutex_exit(&ssh->lock);
+ if (shk->kstat != NULL) {
+ mutex_enter(&shk->lock);
+ kstat_runq_enter(shk->kstat->ks_data);
+ mutex_exit(&shk->lock);
}
}
vdev_queue_pending_remove(vdev_queue_t *vq, zio_t *zio)
{
spa_t *spa = zio->io_spa;
- spa_stats_history_t *ssh = &spa->spa_stats.io_history;
+ spa_history_kstat_t *shk = &spa->spa_stats.io_history;
ASSERT(MUTEX_HELD(&vq->vq_lock));
ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
vq->vq_class[zio->io_priority].vqc_active--;
avl_remove(&vq->vq_active_tree, zio);
- if (ssh->kstat != NULL) {
- kstat_io_t *ksio = ssh->kstat->ks_data;
+ if (shk->kstat != NULL) {
+ kstat_io_t *ksio = shk->kstat->ks_data;
- mutex_enter(&ssh->lock);
+ mutex_enter(&shk->lock);
kstat_runq_exit(ksio);
if (zio->io_type == ZIO_TYPE_READ) {
ksio->reads++;
ksio->writes++;
ksio->nwritten += zio->io_size;
}
- mutex_exit(&ssh->lock);
+ mutex_exit(&shk->lock);
}
}
{
if (aio->io_type == ZIO_TYPE_READ) {
zio_t *pio;
- while ((pio = zio_walk_parents(aio)) != NULL) {
- bcopy((char *)aio->io_data + (pio->io_offset -
- aio->io_offset), pio->io_data, pio->io_size);
+ zio_link_t *zl = NULL;
+ while ((pio = zio_walk_parents(aio, &zl)) != NULL) {
+ abd_copy_off(pio->io_abd, aio->io_abd,
+ 0, pio->io_offset - aio->io_offset, pio->io_size);
}
}
- zio_buf_free(aio->io_data, aio->io_size);
+ abd_free(aio->io_abd);
}
/*
vdev_queue_aggregate(vdev_queue_t *vq, zio_t *zio)
{
zio_t *first, *last, *aio, *dio, *mandatory, *nio;
+ zio_link_t *zl = NULL;
uint64_t maxgap = 0;
uint64_t size;
+ uint64_t limit;
+ int maxblocksize;
boolean_t stretch = B_FALSE;
avl_tree_t *t = vdev_queue_type_tree(vq, zio->io_type);
enum zio_flag flags = zio->io_flags & ZIO_FLAG_AGG_INHERIT;
- void *buf;
+ abd_t *abd;
- if (zio->io_flags & ZIO_FLAG_DONT_AGGREGATE)
- return (NULL);
+ maxblocksize = spa_maxblocksize(vq->vq_vdev->vdev_spa);
+ limit = MAX(MIN(zfs_vdev_aggregation_limit, maxblocksize), 0);
- /*
- * Prevent users from setting the zfs_vdev_aggregation_limit
- * tuning larger than SPA_MAXBLOCKSIZE.
- */
- zfs_vdev_aggregation_limit =
- MIN(zfs_vdev_aggregation_limit, SPA_MAXBLOCKSIZE);
+ if (zio->io_flags & ZIO_FLAG_DONT_AGGREGATE || limit == 0)
+ return (NULL);
first = last = zio;
/*
* Walk backwards through sufficiently contiguous I/Os
- * recording the last non-option I/O.
+ * recording the last non-optional I/O.
*/
while ((dio = AVL_PREV(t, first)) != NULL &&
(dio->io_flags & ZIO_FLAG_AGG_INHERIT) == flags &&
- IO_SPAN(dio, last) <= zfs_vdev_aggregation_limit &&
- IO_GAP(dio, first) <= maxgap) {
+ IO_SPAN(dio, last) <= limit &&
+ IO_GAP(dio, first) <= maxgap &&
+ dio->io_type == zio->io_type) {
first = dio;
if (mandatory == NULL && !(first->io_flags & ZIO_FLAG_OPTIONAL))
mandatory = first;
/*
* Walk forward through sufficiently contiguous I/Os.
+ * The aggregation limit does not apply to optional i/os, so that
+ * we can issue contiguous writes even if they are larger than the
+ * aggregation limit.
*/
while ((dio = AVL_NEXT(t, last)) != NULL &&
(dio->io_flags & ZIO_FLAG_AGG_INHERIT) == flags &&
- IO_SPAN(first, dio) <= zfs_vdev_aggregation_limit &&
- IO_GAP(last, dio) <= maxgap) {
+ (IO_SPAN(first, dio) <= limit ||
+ (dio->io_flags & ZIO_FLAG_OPTIONAL)) &&
+ IO_SPAN(first, dio) <= maxblocksize &&
+ IO_GAP(last, dio) <= maxgap &&
+ dio->io_type == zio->io_type) {
last = dio;
if (!(last->io_flags & ZIO_FLAG_OPTIONAL))
mandatory = last;
}
if (stretch) {
- /* This may be a no-op. */
+ /*
+ * We are going to include an optional io in our aggregated
+ * span, thus closing the write gap. Only mandatory i/os can
+ * start aggregated spans, so make sure that the next i/o
+ * after our span is mandatory.
+ */
dio = AVL_NEXT(t, last);
dio->io_flags &= ~ZIO_FLAG_OPTIONAL;
} else {
+ /* do not include the optional i/o */
while (last != mandatory && last != first) {
ASSERT(last->io_flags & ZIO_FLAG_OPTIONAL);
last = AVL_PREV(t, last);
return (NULL);
size = IO_SPAN(first, last);
- ASSERT3U(size, <=, zfs_vdev_aggregation_limit);
+ ASSERT3U(size, <=, maxblocksize);
- buf = zio_buf_alloc_flags(size, KM_NOSLEEP);
- if (buf == NULL)
+ abd = abd_alloc_for_io(size, B_TRUE);
+ if (abd == NULL)
return (NULL);
aio = zio_vdev_delegated_io(first->io_vd, first->io_offset,
- buf, size, first->io_type, zio->io_priority,
+ abd, size, first->io_type, zio->io_priority,
flags | ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_QUEUE,
vdev_queue_agg_io_done, NULL);
aio->io_timestamp = first->io_timestamp;
if (dio->io_flags & ZIO_FLAG_NODATA) {
ASSERT3U(dio->io_type, ==, ZIO_TYPE_WRITE);
- bzero((char *)aio->io_data + (dio->io_offset -
- aio->io_offset), dio->io_size);
+ abd_zero_off(aio->io_abd,
+ dio->io_offset - aio->io_offset, dio->io_size);
} else if (dio->io_type == ZIO_TYPE_WRITE) {
- bcopy(dio->io_data, (char *)aio->io_data +
- (dio->io_offset - aio->io_offset),
- dio->io_size);
+ abd_copy_off(aio->io_abd, dio->io_abd,
+ dio->io_offset - aio->io_offset, 0, dio->io_size);
}
zio_add_child(dio, aio);
vdev_queue_io_remove(vq, dio);
+ } while (dio != last);
+
+ /*
+ * We need to drop the vdev queue's lock to avoid a deadlock that we
+ * could encounter since this I/O will complete immediately.
+ */
+ mutex_exit(&vq->vq_lock);
+ while ((dio = zio_walk_parents(aio, &zl)) != NULL) {
zio_vdev_io_bypass(dio);
zio_execute(dio);
- } while (dio != last);
+ }
+ mutex_enter(&vq->vq_lock);
return (aio);
}
}
/*
- * For LBA-ordered queues (async / scrub), issue the i/o which follows
- * the most recently issued i/o in LBA (offset) order.
+ * For LBA-ordered queues (async / scrub / initializing), issue the
+ * i/o which follows the most recently issued i/o in LBA (offset) order.
*
* For FIFO queues (sync), issue the i/o with the lowest timestamp.
*/
tree = vdev_queue_class_tree(vq, p);
vq->vq_io_search.io_timestamp = 0;
- vq->vq_io_search.io_offset = vq->vq_last_offset + 1;
- VERIFY3P(avl_find(tree, &vq->vq_io_search,
- &idx), ==, NULL);
+ vq->vq_io_search.io_offset = vq->vq_last_offset - 1;
+ VERIFY3P(avl_find(tree, &vq->vq_io_search, &idx), ==, NULL);
zio = avl_nearest(tree, idx, AVL_AFTER);
if (zio == NULL)
zio = avl_first(tree);
}
vdev_queue_pending_add(vq, zio);
- vq->vq_last_offset = zio->io_offset;
+ vq->vq_last_offset = zio->io_offset + zio->io_size;
return (zio);
}
if (zio->io_type == ZIO_TYPE_READ) {
if (zio->io_priority != ZIO_PRIORITY_SYNC_READ &&
zio->io_priority != ZIO_PRIORITY_ASYNC_READ &&
- zio->io_priority != ZIO_PRIORITY_SCRUB)
+ zio->io_priority != ZIO_PRIORITY_SCRUB &&
+ zio->io_priority != ZIO_PRIORITY_REMOVAL &&
+ zio->io_priority != ZIO_PRIORITY_INITIALIZING)
zio->io_priority = ZIO_PRIORITY_ASYNC_READ;
} else {
ASSERT(zio->io_type == ZIO_TYPE_WRITE);
if (zio->io_priority != ZIO_PRIORITY_SYNC_WRITE &&
- zio->io_priority != ZIO_PRIORITY_ASYNC_WRITE)
+ zio->io_priority != ZIO_PRIORITY_ASYNC_WRITE &&
+ zio->io_priority != ZIO_PRIORITY_REMOVAL &&
+ zio->io_priority != ZIO_PRIORITY_INITIALIZING)
zio->io_priority = ZIO_PRIORITY_ASYNC_WRITE;
}
vdev_queue_t *vq = &zio->io_vd->vdev_queue;
zio_t *nio;
- if (zio_injection_enabled)
- delay(SEC_TO_TICK(zio_handle_io_delay(zio)));
-
mutex_enter(&vq->vq_lock);
vdev_queue_pending_remove(vq, zio);
mutex_exit(&vq->vq_lock);
}
-#if defined(_KERNEL) && defined(HAVE_SPL)
+void
+vdev_queue_change_io_priority(zio_t *zio, zio_priority_t priority)
+{
+ vdev_queue_t *vq = &zio->io_vd->vdev_queue;
+ avl_tree_t *tree;
+
+ /*
+ * ZIO_PRIORITY_NOW is used by the vdev cache code and the aggregate zio
+ * code to issue IOs without adding them to the vdev queue. In this
+ * case, the zio is already going to be issued as quickly as possible
+ * and so it doesn't need any reprioitization to help.
+ */
+ if (zio->io_priority == ZIO_PRIORITY_NOW)
+ return;
+
+ ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
+ ASSERT3U(priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
+
+ if (zio->io_type == ZIO_TYPE_READ) {
+ if (priority != ZIO_PRIORITY_SYNC_READ &&
+ priority != ZIO_PRIORITY_ASYNC_READ &&
+ priority != ZIO_PRIORITY_SCRUB)
+ priority = ZIO_PRIORITY_ASYNC_READ;
+ } else {
+ ASSERT(zio->io_type == ZIO_TYPE_WRITE);
+ if (priority != ZIO_PRIORITY_SYNC_WRITE &&
+ priority != ZIO_PRIORITY_ASYNC_WRITE)
+ priority = ZIO_PRIORITY_ASYNC_WRITE;
+ }
+
+ mutex_enter(&vq->vq_lock);
+
+ /*
+ * If the zio is in none of the queues we can simply change
+ * the priority. If the zio is waiting to be submitted we must
+ * remove it from the queue and re-insert it with the new priority.
+ * Otherwise, the zio is currently active and we cannot change its
+ * priority.
+ */
+ tree = vdev_queue_class_tree(vq, zio->io_priority);
+ if (avl_find(tree, zio, NULL) == zio) {
+ avl_remove(vdev_queue_class_tree(vq, zio->io_priority), zio);
+ zio->io_priority = priority;
+ avl_add(vdev_queue_class_tree(vq, zio->io_priority), zio);
+ } else if (avl_find(&vq->vq_active_tree, zio, NULL) != zio) {
+ zio->io_priority = priority;
+ }
+
+ mutex_exit(&vq->vq_lock);
+}
+
+/*
+ * As these two methods are only used for load calculations we're not
+ * concerned if we get an incorrect value on 32bit platforms due to lack of
+ * vq_lock mutex use here, instead we prefer to keep it lock free for
+ * performance.
+ */
+int
+vdev_queue_length(vdev_t *vd)
+{
+ return (avl_numnodes(&vd->vdev_queue.vq_active_tree));
+}
+
+uint64_t
+vdev_queue_last_offset(vdev_t *vd)
+{
+ return (vd->vdev_queue.vq_last_offset);
+}
+
+#if defined(_KERNEL)
module_param(zfs_vdev_aggregation_limit, int, 0644);
MODULE_PARM_DESC(zfs_vdev_aggregation_limit, "Max vdev I/O aggregation size");
MODULE_PARM_DESC(zfs_vdev_async_write_min_active,
"Min active async write I/Os per vdev");
+module_param(zfs_vdev_initializing_max_active, int, 0644);
+MODULE_PARM_DESC(zfs_vdev_initializing_max_active,
+ "Max active initializing I/Os per vdev");
+
+module_param(zfs_vdev_initializing_min_active, int, 0644);
+MODULE_PARM_DESC(zfs_vdev_initializing_min_active,
+ "Min active initializing I/Os per vdev");
+
+module_param(zfs_vdev_removal_max_active, int, 0644);
+MODULE_PARM_DESC(zfs_vdev_removal_max_active,
+ "Max active removal I/Os per vdev");
+
+module_param(zfs_vdev_removal_min_active, int, 0644);
+MODULE_PARM_DESC(zfs_vdev_removal_min_active,
+ "Min active removal I/Os per vdev");
+
module_param(zfs_vdev_scrub_max_active, int, 0644);
-MODULE_PARM_DESC(zfs_vdev_scrub_max_active, "Max active scrub I/Os per vdev");
+MODULE_PARM_DESC(zfs_vdev_scrub_max_active,
+ "Max active scrub I/Os per vdev");
module_param(zfs_vdev_scrub_min_active, int, 0644);
-MODULE_PARM_DESC(zfs_vdev_scrub_min_active, "Min active scrub I/Os per vdev");
+MODULE_PARM_DESC(zfs_vdev_scrub_min_active,
+ "Min active scrub I/Os per vdev");
module_param(zfs_vdev_sync_read_max_active, int, 0644);
MODULE_PARM_DESC(zfs_vdev_sync_read_max_active,
module_param(zfs_vdev_sync_write_min_active, int, 0644);
MODULE_PARM_DESC(zfs_vdev_sync_write_min_active,
"Min active sync write I/Os per vdev");
+
+module_param(zfs_vdev_queue_depth_pct, int, 0644);
+MODULE_PARM_DESC(zfs_vdev_queue_depth_pct,
+ "Queue depth percentage for each top-level vdev");
#endif
projects / mirror_zfs.git / blobdiff