Btrfs devel - Feb 2012 - [weird] High CPU usage caused by btrfs-transaction thread busy doing find_next_zero_bit()

Dear devs,

My filesystem is super-sluggish since about a week, and perf top tells me
that find_next_bit(), find_next_zero_bit() is eating my netbook''s CPU.

The kernel is 3.3-rc3+188 (g3ec1e88) and I don''t use this laptop a lot,
so I''m ready to cooperate.

In the btrfs-transaction thread, in descending order of CPU usage:
find_next_zero_bit, find_next_bit, rb_next, setup_cluster_bitmap,
setup_cluster_no_bitmap, tree_search_offset.

I''m on #btrfs (Zougloub)

Regards,

-- 
cJ
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On Wed, 22 Feb 2012 11:20:21 -0500
Jérôme Carretero <cJ-ko@zougloub.eu> wrote:
> My filesystem is super-sluggish since about a week, and perf top tells me
> that find_next_bit(), find_next_zero_bit() is eating my netbook''s
CPU.
> 
> The kernel is 3.3-rc3+188 (g3ec1e88) and I don''t use this laptop a
lot,
> so I''m ready to cooperate.
This machine was updated to today''s kernel, and behaves same as before.
scrub says nothing, but btrfsck doesn''t like to be run.

Does this interest someone (metadump image) or I can reformat the drive ?

Regards,

-- 
cJ
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