From: Theodore Ts'o <tytso@mit.edu>
To: "Joseph D. Wagner" <joe@josephdwagner.info>
Cc: linux-ext4@vger.kernel.org
Subject: Re: dump ext4 performance degrades linearly as disk fills
Date: Tue, 17 Jun 2014 10:51:29 -0400 [thread overview]
Message-ID: <20140617145129.GB5054@thunk.org> (raw)
In-Reply-To: <53A04BEB.7000401@josephdwagner.info>
Hmm, I've looked at your dumpe2fs, and the free space looks pretty
good. Was this taken before or after you ran the backup?
How big are your full and incremental backups? And were you testing
the time when writing an incremental backup or a full backup?
Finally, can you use the debugfs program, and then use the debugfs's
"extents" commands? i.e.
% debugfs /dev/heap/u1
debugfs: extents linux-image-3.15.0-00037-g7428869-dbg_3.15.0-00037-g7428869-86_amd64.deb
Level Entries Logical Physical Length Flags
0/ 0 1/ 3 0 - 9 16898520 - 16898529 10
0/ 0 2/ 3 10 - 2047 17518592 - 17520629 2038
0/ 0 3/ 3 2048 - 9881 17500160 - 17507993 7834
debugfs: q
... and send me the output?
Thanks!!
- Ted
next prev parent reply other threads:[~2014-06-17 14:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-16 5:43 dump ext4 performance degrades linearly as disk fills Joseph D. Wagner
2014-06-16 12:42 ` Theodore Ts'o
2014-06-17 14:08 ` Joseph D. Wagner
2014-06-17 14:51 ` Theodore Ts'o [this message]
2014-06-16 21:48 ` Andreas Dilger
-- strict thread matches above, loose matches on Subject: below --
2014-06-19 18:42 Joseph D. Wagner
2014-06-21 0:38 ` Theodore Ts'o
2014-07-29 20:55 ` Phillip Susi
2014-07-29 22:48 ` Joseph D. Wagner
2014-06-20 23:59 Joseph D. Wagner
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