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: <20120804195151.98BC111FC62@bugzilla.kernel.org>
Date:	Sat,  4 Aug 2012 19:51:51 +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 #15 from Theodore Tso <tytso@....edu>  2012-08-04 19:51:51 ---
The delay before the write starts is normal; that's encoded in how the
writeback code handles dirty pages.  We don't start writes the instant that
pages are dirtied in the buffer cache.

In any case, if you have arguments about how the writeback code makes its
choices, it's kinda of pointless to be complaining on a bug targetted at the
ext4 developers, since we start the writeback when the VM system asks us to
start write pages belonging to a particular inode....

See /usr/src/linux/Documentation/sysctl/vm.txt for more information.

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