Comment # 60 on bug 1017461 from Jan Ritzerfeld

(In reply to Richard Weinberger from comment #59)
> So, this issue should now be fixed by the following upstream commit?
> [...]

1. The time and CPU power needed for a simple "btrfs balance" is still
ridiculously high, and
2. the performance stall is still there, even if less frequently.

I updated the kernel and re-enabled quotas (not that easy). And even meta data
balancing still
1. takes 15 minutes while completely hogging 1 CPU using a laptop on battery
(recipe for a disaster), and
2. frequently delays starting shell commands, causes severe WiFi packet loss,
and locks up the system for several seconds.

Unfortunately, this issue is not fixed.