From: Theodore Ts'o <tytso@mit.edu>
To: Roy Yang <bsdnet@outlook.com>
Cc: "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: fsync stuck at jbd2_log_wait_commit on NVMe devices
Date: Thu, 13 Aug 2015 09:09:53 -0400 [thread overview]
Message-ID: <20150813130953.GA26095@thunk.org> (raw)
In-Reply-To: <COL130-W737C0A6D747C8E035546EED67E0@phx.gbl>
On Wed, Aug 12, 2015 at 04:34:17PM -0700, Roy Yang wrote:
> Hi Ted,
>
> Appreciate your time, and will get the log from normal work load.
>
> BTW, the previous JBD2 log is from the node which is in bad state.
> Normal node finish within 3 seconds; while on this node, it takes 10 seconds.
Ah, you didn't say that.
If this is a node in a bad state, and we're not seeing any real delays
from the jbd2 logs, then it sounds very much like the problem is a
hardware issue (or maybe an NVMe device driver issue). You might want
to use blktrace to see how long the underlying I/O operations are
taking to complete.
- Ted
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prev parent reply other threads:[~2015-08-13 13:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-12 16:57 fsync stuck at jbd2_log_wait_commit on NVMe devices Roy Yang
2015-08-12 18:37 ` Theodore Ts'o
2015-08-12 19:28 ` Roy Yang
2015-08-12 21:43 ` Roy Yang
2015-08-12 22:34 ` Theodore Ts'o
2015-08-12 23:34 ` Roy Yang
2015-08-13 13:09 ` Theodore Ts'o [this message]
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