On 2019/9/25 下午12:15, Chris Murphy wrote:
> $ sudo btrfs balance start -dconvert=single,soft /
> 
> It's definitely a 5.3.0 regression, it works without -f on 5.2.15.
> Super slow. The media should be able to write at 20M/s.

Already pinned down and send the fix (CCed to you)
https://patchwork.kernel.org/patch/11159927/

Will send out a test case soon too.

Thanks,
Qu

> 
> Total DISK READ :       0.00 B/s | Total DISK WRITE :       0.00 B/s
> Actual DISK READ:       0.00 B/s | Actual DISK WRITE:    1418.15 K/s
>     TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>
> COMMAND
>    1138 be/4 root        0.00 B/s    0.00 B/s  0.00 % 99.18 % btrfs
> balance start -dconvert single soft /
>     402 be/4 root        0.00 B/s    0.00 B/s  0.00 %  3.09 %
> [kworker/0:2-events]
> 
> But anyway, it completed without error.
> 
> 
> ---
> Chris Murphy
> 

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