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xlog_space_left: head behind tail

To: xfs@xxxxxxxxxxx
Subject: xlog_space_left: head behind tail
From: Jan Kara <jack@xxxxxxx>
Date: Thu, 23 Feb 2012 11:48:53 +0100
User-agent: Mutt/1.5.20 (2009-06-14)
  Hello,

  when I run:
while true; do ~/tests/xfstests-dev/ltp/fsstress -d /mnt -n 10000 -p 4; done

and in parallel

while true; do ./fsfreeze /mnt; sync; ./fsfreeze -u /mnt; sleep 3; done

where fsfreeze is a small utility freezing and unfreezing filesystem. I get
warnings like:
[ 2029.103193] XFS (vdb1): xlog_space_left: head behind tail
[ 2029.103195]   tail_cycle = 10, tail_bytes = 6036480
[ 2029.103197]   GH   cycle = 10, GH   bytes = 6035728
[ 2029.103218] XFS (vdb1): xlog_space_left: head behind tail
[ 2029.103219]   tail_cycle = 10, tail_bytes = 6036480
[ 2029.103220]   GH   cycle = 10, GH   bytes = 6035728
[ 2033.269796] XFS (vdb1): xlog_space_left: head behind tail
[ 2033.269800]   tail_cycle = 10, tail_bytes = 6400512
[ 2033.269803]   GH   cycle = 10, GH   bytes = 6399752
[ 2033.269830] XFS (vdb1): xlog_space_left: head behind tail
[ 2033.269835]   tail_cycle = 10, tail_bytes = 6400512
[ 2033.269838]   GH   cycle = 10, GH   bytes = 6399752
[ 2033.269847] XFS (vdb1): xlog_space_left: head behind tail
[ 2033.269850]   tail_cycle = 10, tail_bytes = 6400512
[ 2033.269852]   GH   cycle = 10, GH   bytes = 6399752
[ 2033.269892] XFS (vdb1): xlog_space_left: head behind tail
[ 2033.269894]   tail_cycle = 10, tail_bytes = 6400512
[ 2033.269896]   GH   cycle = 10, GH   bytes = 6399752
[ 2033.269915] XFS (vdb1): xlog_space_left: head behind tail
[ 2033.269918]   tail_cycle = 10, tail_bytes = 6400512
[ 2033.269920]   GH   cycle = 10, GH   bytes = 6399752

They usually start to appear like 20 minutes after starting the tests and
when they start to appear they happen every couple of seconds (as you can
see from the timestamps). Is it a real problem or just annoyance?

                                                                Honza
-- 
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR

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