Hello,
Trying to understand the ZFS IO scheduler, because of the async nature it is
not very apparent, can someone give a short explanation for each of these stack
traces and for their frequency
this is the command
dd if=/dev/zero of=/test/test1/trash count=1 bs=1024k;sync
no other IO is happening to the test pool. OS is on a zfs pool (rpool)
I don't see any zio_vdev_io_start in any of the function stacks, any idea why?
dtrace -n 'io:::start { @a[stack()] = count(); }'
dtrace: description 'io:::start ' matched 6 probes
genunix`bdev_strategy+0x44
zfs`vdev_disk_io_start+0x2a8
zfs`zio_execute+0x74
genunix`taskq_thread+0x1a4
unix`thread_start+0x4
20
genunix`bdev_strategy+0x44
zfs`vdev_disk_io_start+0x2a8
zfs`zio_execute+0x74
zfs`vdev_queue_io_done+0x84
zfs`vdev_disk_io_done+0x4
zfs`zio_execute+0x74
genunix`taskq_thread+0x1a4
unix`thread_start+0x4
31
genunix`bdev_strategy+0x44
zfs`vdev_disk_io_start+0x2a8
zfs`zio_execute+0x74
zfs`vdev_mirror_io_start+0x1b4
zfs`zio_execute+0x74
zfs`vdev_mirror_io_start+0x1b4
zfs`zio_execute+0x74
genunix`taskq_thread+0x1a4
unix`thread_start+0x4
34
genunix`bdev_strategy+0x44
zfs`vdev_disk_io_start+0x2a8
zfs`zio_execute+0x74
zfs`vdev_mirror_io_start+0x1b4
zfs`zio_execute+0x74
genunix`taskq_thread+0x1a4
unix`thread_start+0x4
45
genunix`bdev_strategy+0x44
zfs`vdev_disk_io_start+0x2a8
zfs`zio_execute+0x74
zfs`vdev_queue_io_done+0x9c
zfs`vdev_disk_io_done+0x4
zfs`zio_execute+0x74
genunix`taskq_thread+0x1a4
unix`thread_start+0x4
53
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