Wrapping eatmydata around dpkg "fixes" the problem; details below.
Trent Buck wrote (offlist):
> As I now understand it, the facts are these:
>
> - lucid's dpkg uses an fsync-per-file
>
> - lucid-security's dpkg uses a sync-per-rename, because fsync was
> slow (only on ext4/btrfs, I think).
>
> - Because containers share a kernel, sync causes ALL writes to ALL
> filesystems to be flushed to disk, and dpkg blocks while this
> takes place.
>
> - Because the syncs come in quick succession, and there are writes
> on other containers (e.g. postfix, syslog, mysql), this borks at
> least dpkg, and likely other stuff.
>
> - using ext3 instead of ext4 won't help significantly. Reducing the
> commit interval from 60 (ext4 default) to 5 (ext3 default) might
> help a little.
>
> We can work around this issue in a few ways:
>
> - disable lucid-security (at least for dpkg), which should ensure
> only fsync is used. Possibly switch to ext3 to avoid problems
> with ext4 vs. fsync.
>
> - backport patches from Debian's latest dpkg to lucid-security's
> dpkg. NOT FUN.
>
> - backport dpkg from a newer ubuntu release. NOT FUN.
>
> - use the EATMYDATA package to discard all fsync and sync calls from
> dpkg.
>
> Using eatmydata, worst case is that dpkg is running AND there is a
> power outage, then THAT FILESYSTEM (i.e. not other fses) gets
> corrupted. i.e. worst case you lose that container and have to
> rebuild it. Non-container filesystems like home, cyber, mail should
> be completely safe.
>
> Therefore, I'm aiming to have lxc-create wrap /usr/bin/dpkg with
> eatmydata in containers. Omega itself will still call sync() when you
> apply security updates to it, but that happens an order of magnitude
> less often than containers running dpkg.
This worked: placing an unmodified eatmydata .deb from sid in a local
apt repo, and running the following:
aptitude install eatmydata -yq
dpkg-divert --rename /usr/bin/dpkg
cat >/usr/bin/dpkg <<-EOT
#!/bin/sh
exec eatmydata /usr/bin/dpkg.distrib "\$@"
EOT
chmod +x /usr/bin/dpkg
Daniel Lezcano <daniel.lezc...@free.fr> writes:
> Assuming you have an ubuntu version on your host, I think the kernel is
> compiled with DETECT_HUNG_TASK, where a kernel stack trace is displayed
> if a task stays in the 'D' state indefinitively. Do you have such stack
> on your logs ?
That is the case, here are the entries I have:
>From logch...@stomp.cybersource.com.au Tue Feb 1 21:02:05 2011
Return-Path: <logch...@stomp.cybersource.com.au>
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Received: from localhost (logos.cybersource.com.au [192.168.155.185])
by stomp.cybersource.com.au (Postfix) with ESMTP id 74F6D17E6
for <logcheck>; Tue, 1 Feb 2011 21:02:05 +1100 (EST)
To: logcheck
Subject: logos.cybersource.com.au 2011-02-01 21:02:02+11:00 System Events
Auto-Submitted: auto-generated
MIME-Version: 1.0 (mime-construct 1.10)
Content-Type: multipart/mixed; boundary=unattainability
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--unattainability
Report attached
--unattainability
Content-Disposition: attachment; filename=logcheck_report
Content-Type: text/plain; name=logcheck_report
System Events
=-=-=-=-=-=-=
0 Lines skipped (already processed)
0 Patterns to ignore
0 Ignored lines
1 omega kernel: [1791939.892914] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1791939.897794] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1791939.907943] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1791939.907946] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1791939.907949] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1791939.907951] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1791939.907953] Call Trace:
1 omega kernel: [1791939.907960] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1791939.907963] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1791939.907965] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1791939.907967] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1791939.907971] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1791939.907975] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1791939.907978] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1791939.907982] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1791939.907986] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1791939.907989] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1791939.907992] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1791939.907997] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1792167.706959] ida_remove called for id=1 which is not allocated.
1 omega kernel: [1792298.912837] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1792298.917748] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1792298.927667] dpkg D 0000000000000000 0 2168 1205 0x00000000
1 omega kernel: [1792298.927671] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1792298.927673] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1792298.927675] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1792298.927680] Call Trace:
1 omega kernel: [1792298.927686] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1792298.927690] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1792298.927692] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1792298.927694] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1792298.927696] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1792298.927699] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1792298.927701] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1792298.927704] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1792298.927707] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1792298.927709] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1792298.927711] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1792298.927715] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1792897.272637] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1792897.277546] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1792897.287562] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1792897.287565] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1792897.287568] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1792897.287570] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1792897.287572] Call Trace:
1 omega kernel: [1792897.287581] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1792897.287585] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1792897.287587] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1792897.287589] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1792897.287592] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1792897.287594] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1792897.287596] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1792897.287599] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1792897.287602] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1792897.287604] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1792897.287605] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1792897.287609] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1793016.952458] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1793016.957475] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1793016.967221] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1793016.967224] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1793016.967226] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1793016.967231] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1793016.967233] Call Trace:
1 omega kernel: [1793016.967240] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1793016.967243] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1793016.967245] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1793016.967247] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1793016.967250] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1793016.967252] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1793016.967254] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1793016.967257] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1793016.967260] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1793016.967263] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1793016.967266] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1793016.967270] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1793136.632133] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1793136.637091] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1793136.647120] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1793136.647123] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1793136.647126] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1793136.647128] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1793136.647133] Call Trace:
1 omega kernel: [1793136.647139] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1793136.647143] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1793136.647145] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1793136.647147] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1793136.647150] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1793136.647152] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1793136.647154] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1793136.647157] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1793136.647160] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1793136.647162] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1793136.647164] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1793136.647168] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1793256.311818] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1793256.321513] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1793256.331507] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1793256.331511] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1793256.331513] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1793256.331515] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1793256.331520] Call Trace:
1 omega kernel: [1793256.331527] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1793256.331530] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1793256.331532] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1793256.331534] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1793256.331537] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1793256.331539] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1793256.331541] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1793256.331544] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1793256.331547] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1793256.331549] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1793256.331551] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1793256.331555] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1793375.991457] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1793375.996130] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1793376.005471] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1793376.005474] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1793376.005477] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1793376.005479] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1793376.005481] Call Trace:
1 omega kernel: [1793376.005487] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1793376.005490] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1793376.005492] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1793376.005494] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1793376.005497] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1793376.005499] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1793376.005501] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1793376.005504] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1793376.005506] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1793376.005508] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1793376.005510] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1793376.005513] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1793495.671165] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1793495.676039] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1793495.686078] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1793495.686081] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1793495.686084] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1793495.686086] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1793495.686091] Call Trace:
1 omega kernel: [1793495.686097] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1793495.686100] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1793495.686102] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1793495.686105] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1793495.686107] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1793495.686109] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1793495.686112] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1793495.686115] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1793495.686117] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1793495.686119] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1793495.686121] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1793495.686125] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1793615.350829] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1793615.355859] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1793615.365692] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1793615.365695] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1793615.365698] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1793615.365700] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1793615.365705] Call Trace:
1 omega kernel: [1793615.365711] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1793615.365714] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1793615.365716] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1793615.365719] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1793615.365721] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1793615.365724] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1793615.365726] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1793615.365729] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1793615.365732] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1793615.365734] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1793615.365737] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1793615.365741] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
1 omega kernel: [1793735.030543] INFO: task dpkg:2168 blocked for more than 120 seconds.
1 omega kernel: [1793735.035300] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
1 omega kernel: [1793735.045095] dpkg D 00000000ffffffff 0 2168 1205 0x00000000
1 omega kernel: [1793735.045098] ffff8800a3393d38 0000000000000082 0000000000015bc0 0000000000015bc0
1 omega kernel: [1793735.045100] ffff8800a32f4858 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f44a0
1 omega kernel: [1793735.045102] 0000000000015bc0 ffff8800a3393fd8 0000000000015bc0 ffff8800a32f4858
1 omega kernel: [1793735.045107] Call Trace:
1 omega kernel: [1793735.045114] [<ffffffff81558ced>] schedule_timeout+0x22d/0x300
1 omega kernel: [1793735.045117] [<ffffffff8105dff2>] ? enqueue_entity+0x132/0x1b0
1 omega kernel: [1793735.045119] [<ffffffff8105e0cd>] ? enqueue_task_fair+0x5d/0xa0
1 omega kernel: [1793735.045121] [<ffffffff81557f96>] wait_for_common+0xd6/0x180
1 omega kernel: [1793735.045124] [<ffffffff81059a06>] ? try_to_wake_up+0x2e6/0x470
1 omega kernel: [1793735.045126] [<ffffffff81059b90>] ? default_wake_function+0x0/0x20
1 omega kernel: [1793735.045128] [<ffffffff815580fd>] wait_for_completion+0x1d/0x20
1 omega kernel: [1793735.045131] [<ffffffff811669b7>] sync_inodes_sb+0x87/0xb0
1 omega kernel: [1793735.045134] [<ffffffff8116b292>] __sync_filesystem+0x82/0x90
1 omega kernel: [1793735.045136] [<ffffffff8116b379>] sync_filesystems+0xd9/0x130
1 omega kernel: [1793735.045137] [<ffffffff8116b431>] sys_sync+0x21/0x40
1 omega kernel: [1793735.045142] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
--unattainability--
------------------------------------------------------------------------------
The modern datacenter depends on network connectivity to access resources
and provide services. The best practices for maximizing a physical server's
connectivity to a physical network are well understood - see how these
rules translate into the virtual world?
http://p.sf.net/sfu/oracle-sfdevnlfb
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