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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Date:	Sat,  4 Aug 2012 20:00:28 +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


Artem S. Tashkinov <t.artem@...lcity.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID




--- Comment #16 from Artem S. Tashkinov <t.artem@...lcity.com>  2012-08-04 20:00:28 ---
(In reply to comment #15)
> 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.

Thanks for letting us know, probably what I perceived as a regression in ext4fs
was in fact a change in the VM writeback code.

It's still weird and terribly counter intuitive as no other OS exhibit this
behavior, but now that I know why it happens I need to file a different bug
report.

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