linux-ext4 - [Bug 20902] High IO wait when writing to ext4

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Message-Id: <201010291611.o9TGB2xa006844@demeter2.kernel.org>
Date:	Fri, 29 Oct 2010 16:11:02 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 20902] High IO wait when writing to ext4

https://bugzilla.kernel.org/show_bug.cgi?id=20902


Eric Sandeen <sandeen@...hat.com> changed:

           What    |Removed                     |Added
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                 CC|                            |sandeen@...hat.com




--- Comment #8 from Eric Sandeen <sandeen@...hat.com>  2010-10-29 16:10:59 ---
Any chance you can test w/o LUKS to see how that affects things?

If I had to guess I'd say things are stuck behind here:

[  554.110652] flush-252:1   D ffff880001e14cc0     0  2186      2 0x00000000
[  554.110679] Call Trace:
[  554.110686]  [<ffffffff81586503>] io_schedule+0x73/0xc0
[  554.110692]  [<ffffffff81180ab5>] sync_buffer+0x45/0x50
[  554.110714]  [<ffffffff81586e8d>] out_of_line_wait_on_bit+0x7d/0x90
[  554.110725]  [<ffffffff811809f8>] __wait_on_buffer+0x28/0x30
[  554.110732]  [<ffffffff81217199>] ext4_mb_init_cache+0x389/0x900

I guess ext4_mb_init_cache() is in:

        /* wait for I/O completion */
        for (i = 0; i < groups_per_page && bh[i]; i++)
                wait_on_buffer(bh[i]);

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