From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 20902] High IO wait when writing to ext4
Date: Fri, 29 Oct 2010 16:11:02 GMT
Message-ID: <201010291611.o9TGB2xa006844@demeter2.kernel.org>
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Eric Sandeen changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sandeen@redhat.com
--- Comment #8 from Eric Sandeen 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] [] io_schedule+0x73/0xc0
[ 554.110692] [] sync_buffer+0x45/0x50
[ 554.110714] [] out_of_line_wait_on_bit+0x7d/0x90
[ 554.110725] [] __wait_on_buffer+0x28/0x30
[ 554.110732] [] 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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