linux-ext4 - [Bug 16380] ext2/ext4 filesystem "hangs" for a few seconds when trying to write a lot of data to a freshly RW mounted FS

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Message-Id: <20120804181320.D191711FC62@bugzilla.kernel.org>
Date:	Sat,  4 Aug 2012 18:13:20 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 16380] ext2/ext4 filesystem "hangs" for a few seconds when
 trying to write a lot of data to a freshly RW mounted FS

https://bugzilla.kernel.org/show_bug.cgi?id=16380

--- Comment #12 from Theodore Tso <tytso@....edu>  2012-08-04 18:13:20 ---
I wasn't able to duplicate this with an underlying ext4 file system, with the
loop file system being ext2, using a 3.5 kernel on a system with 16G.

I tried both using a variety of small and medium sized files, as well as one
very large file, and I didn't see any unexplained stuttering in write
bandwidth.   (There were times when cp -r was clearly writing to the in-memory
page cache, and the writeback hadn't begone yet.   There were also times when
we couldn't do any more writing, because we were busy reading from the source
drive.  But it all looked pretty normal to me.)

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