[PATCH 0/2] btrfs: adjust async discard tuning

[Boris Burkov <boris@bur.io>]

Since discard=async became the implicit default in btrfs in the
6.2 kernel, there have been numerous complaints about discard being
too spread out on workstation systems. This results in situations like
a users drive not being idle for an unexpectedly long period of time.

This is caused by a relatively low default iops limit of 10, so this
series raises the default limit to 1000 (1ms delay) and modifies a
weird fallback behavior for limit=0 to be interpreted as unlimited.

Link: https://lore.kernel.org/linux-btrfs/ZCxKc5ZzP3Np71IC@infradead.org/T/#m6ebdeb475809ed7714b21b8143103fb7e5a966da
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2182228
Link: https://www.reddit.com/r/archlinux/comments/121htxn/btrfs_discard_storm_on_62x_kernel/

Boris Burkov (2):
  btrfs: set default discard iops_limit to 1000
  btrfs: reinterpret async discard iops_limit=0 as no delay

 fs/btrfs/discard.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

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2.40.0