[Kernel-packages] [Bug 1297522] Re: Since Trusty /proc/diskstats shows weird values
** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty
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https://bugs.launchpad.net/bugs/1297522
Title:
Since Trusty /proc/diskstats shows weird values
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Trusty:
Fix Committed
Bug description:
SRU Justification:
Impact: Tools that rely on diskstats may report incorrect data in
certain conditions. In particular diskstats in a VM may report
incorrect statistics.
Fix: 0fec08b4ecfc36fd8a64432343b2964fb86d2675 ( in 3.14-rc1 )
Testcase:
- Install a VM with the affected kernel
- Run cat /proc/diskstats | awk '$3==vda { print $7/$4, $11/$8 }'
- If the two values are much larger compared to the v3.14-rc1 kernel in the
same VM, we have failed. For example in a failing case I see: 132.44 5458.34;
in a passing case I see: 0.19334 5.90476.
--
After upgrading some virtual machines (KVM) to Trusty I noticed really
high I/O wait times, e.g. Munin graphs now show up to 200 seconds(!)
read I/O wait time. See attached image. Of course real latency isn't
higher than before, it's only /proc/diskstats that shows totally wrong
numbers...
$ cat /proc/diskstats | awk '$3==vda { print $7/$4, $11/$8 }'
1375.44 13825.1
From the documentation for /proc/diskstats field 4 is total number of
reads completed, field 7 is the total time spent reading in
milliseconds, and fields 8 and 11 are the same for writes. So above
numbers are the average read and write latency in milliseconds.
Same weird numbers with iowait. Note the column await (average time
in milliseconds for I/O requests):
$ iostat -dx 1 60
Linux 3.13.0-19-generic (munin) 03/25/14_x86_64_(2 CPU)
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 2.3016.75 72.45 24.52 572.79 778.3727.87
1.57 620.00 450.20 1121.83 1.71 16.54
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.0052.000.00 25.00 0.00 308.0024.64
0.30 27813.920.00 27813.92 0.48 1.20
I upgraded the host system to Trusty too, however there
/proc/diskstats output is normal as before.
$ uname -r
3.13.0-19-generic
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1297522] Re: Since Trusty /proc/diskstats shows weird values
No issues with 3.14 kernel
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
** Tags added: kernel-fixed-upstream
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https://bugs.launchpad.net/bugs/1297522
Title:
Since Trusty /proc/diskstats shows weird values
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
After upgrading some virtual machines (KVM) to Trusty I noticed really
high I/O wait times, e.g. Munin graphs now show up to 200 seconds(!)
read I/O wait time. See attached image. Of course real latency isn't
higher than before, it's only /proc/diskstats that shows totally wrong
numbers...
$ cat /proc/diskstats | awk '$3==vda { print $7/$4, $11/$8 }'
1375.44 13825.1
From the documentation for /proc/diskstats field 4 is total number of
reads completed, field 7 is the total time spent reading in
milliseconds, and fields 8 and 11 are the same for writes. So above
numbers are the average read and write latency in milliseconds.
Same weird numbers with iowait. Note the column await (average time
in milliseconds for I/O requests):
$ iostat -dx 1 60
Linux 3.13.0-19-generic (munin) 03/25/14_x86_64_(2 CPU)
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 2.3016.75 72.45 24.52 572.79 778.3727.87
1.57 620.00 450.20 1121.83 1.71 16.54
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.0052.000.00 25.00 0.00 308.0024.64
0.30 27813.920.00 27813.92 0.48 1.20
I upgraded the host system to Trusty too, however there
/proc/diskstats output is normal as before.
$ uname -r
3.13.0-19-generic
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1297522] [NEW] Since Trusty /proc/diskstats shows weird values
Public bug reported:
After upgrading some virtual machines (KVM) to Trusty I noticed really
high I/O wait times, e.g. Munin graphs now show up to 200 seconds(!)
read I/O wait time. See attached image. Of course real latency isn't
higher than before, it's only /proc/diskstats that shows totally wrong
numbers...
$ cat /proc/diskstats | awk '$3==vda { print $7/$4, $11/$8 }'
1375.44 13825.1
From the documentation for /proc/diskstats field 4 is total number of
reads completed, field 7 is the total time spent reading in
milliseconds, and fields 8 and 11 are the same for writes. So above
numbers are the average read and write latency in milliseconds.
Same weird numbers with iowait. Note the column await (average time
in milliseconds for I/O requests):
$ iostat -dx 1 60
Linux 3.13.0-19-generic (munin) 03/25/14_x86_64_(2 CPU)
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 2.3016.75 72.45 24.52 572.79 778.3727.87
1.57 620.00 450.20 1121.83 1.71 16.54
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.0052.000.00 25.00 0.00 308.0024.64
0.30 27813.920.00 27813.92 0.48 1.20
I upgraded the host system to Trusty too, however there /proc/diskstats
output is normal as before.
$ uname -r
3.13.0-19-generic
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: disk latency graph after upgrading to trusty
https://bugs.launchpad.net/bugs/1297522/+attachment/4043602/+files/vda-month.png
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1297522
Title:
Since Trusty /proc/diskstats shows weird values
Status in “linux” package in Ubuntu:
New
Bug description:
After upgrading some virtual machines (KVM) to Trusty I noticed really
high I/O wait times, e.g. Munin graphs now show up to 200 seconds(!)
read I/O wait time. See attached image. Of course real latency isn't
higher than before, it's only /proc/diskstats that shows totally wrong
numbers...
$ cat /proc/diskstats | awk '$3==vda { print $7/$4, $11/$8 }'
1375.44 13825.1
From the documentation for /proc/diskstats field 4 is total number of
reads completed, field 7 is the total time spent reading in
milliseconds, and fields 8 and 11 are the same for writes. So above
numbers are the average read and write latency in milliseconds.
Same weird numbers with iowait. Note the column await (average time
in milliseconds for I/O requests):
$ iostat -dx 1 60
Linux 3.13.0-19-generic (munin) 03/25/14_x86_64_(2 CPU)
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 2.3016.75 72.45 24.52 572.79 778.3727.87
1.57 620.00 450.20 1121.83 1.71 16.54
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.0052.000.00 25.00 0.00 308.0024.64
0.30 27813.920.00 27813.92 0.48 1.20
I upgraded the host system to Trusty too, however there
/proc/diskstats output is normal as before.
$ uname -r
3.13.0-19-generic
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1297522] Re: Since Trusty /proc/diskstats shows weird values
** Attachment added: apport.linux.WwkgUu.apport
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1297522/+attachment/4043636/+files/apport.linux.WwkgUu.apport
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1297522
Title:
Since Trusty /proc/diskstats shows weird values
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
After upgrading some virtual machines (KVM) to Trusty I noticed really
high I/O wait times, e.g. Munin graphs now show up to 200 seconds(!)
read I/O wait time. See attached image. Of course real latency isn't
higher than before, it's only /proc/diskstats that shows totally wrong
numbers...
$ cat /proc/diskstats | awk '$3==vda { print $7/$4, $11/$8 }'
1375.44 13825.1
From the documentation for /proc/diskstats field 4 is total number of
reads completed, field 7 is the total time spent reading in
milliseconds, and fields 8 and 11 are the same for writes. So above
numbers are the average read and write latency in milliseconds.
Same weird numbers with iowait. Note the column await (average time
in milliseconds for I/O requests):
$ iostat -dx 1 60
Linux 3.13.0-19-generic (munin) 03/25/14_x86_64_(2 CPU)
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 2.3016.75 72.45 24.52 572.79 778.3727.87
1.57 620.00 450.20 1121.83 1.71 16.54
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.00 0.000.000.00 0.00 0.00 0.00
0.000.000.000.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/srkB/swkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
vda 0.0052.000.00 25.00 0.00 308.0024.64
0.30 27813.920.00 27813.92 0.48 1.20
I upgraded the host system to Trusty too, however there
/proc/diskstats output is normal as before.
$ uname -r
3.13.0-19-generic
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1297522/+subscriptions
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[Kernel-packages] [Bug 956479] Re: analog audio output is changed to HDMI, after display standby with kernel 3.0.0-17.30
No issue anymore. I can't say when it was fixed because I had disabled HDMI in BIOS until now. ** Changed in: linux (Ubuntu) Status: Incomplete = Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/956479 Title: analog audio output is changed to HDMI, after display standby with kernel 3.0.0-17.30 Status in “linux” package in Ubuntu: Fix Released Bug description: I have a display connected to HDMI port and speakers connected to analog out. In gnome-control-center the sound device is set to Analog Stereo Duplex. However, after the display was in standby mode, the audio is always sent to the HDMI output, so I have to change it back to Analog Stereo Duplex in gnome-control-center... This happens after installing linux-image-3.0.0-17.30 from oneiric-proposed, and I think it is related to the drm/i915: HDMI hot remove notification to audio driver patch. Old kernel 3.0.0-16 works well. This is a commit regression of 2deed761188d7480eb5f7efbfe7aa77f09322ed8. WORKAROUND: disabling HDMI audio in BIOS. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: linux-image-3.0.0-17-generic 3.0.0-17.30 ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22 Uname: Linux 3.0.0-17-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 1.23-0ubuntu4 Architecture: amd64 ArecordDevices: List of CAPTURE Hardware Devices card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: holger 3541 F pulseaudio CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xfe62 irq 51' Mixer name : 'Intel CougarPoint HDMI' Components : 'HDA:10ec0892,8086201b,00100302 HDA:80862805,80862805,0010' Controls : 41 Simple ctrls : 21 Date: Thu Mar 15 22:22:32 2012 InstallationMedia: Ubuntu 11.10 Oneiric Ocelot - Release amd64 (20111012) IwConfig: lono wireless extensions. eth0 no wireless extensions. virbr0no wireless extensions. ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-17-generic root=UUID=ecad89b7-f7cc-4ab3-8017-089af5334ee1 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.0.0-17-generic N/A linux-backports-modules-3.0.0-17-generic N/A linux-firmware1.60.1 RfKill: 0: hci0: Bluetooth Soft blocked: no Hard blocked: no SourcePackage: linux StagingDrivers: mei UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/28/2011 dmi.bios.vendor: Intel Corp. dmi.bios.version: DBZ6810H.86A.0032.2011.0928.1502 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: DZ68DB dmi.board.vendor: Intel Corporation dmi.board.version: AAG27985-104 dmi.chassis.type: 3 dmi.modalias: dmi:bvnIntelCorp.:bvrDBZ6810H.86A.0032.2011.0928.1502:bd09/28/2011:svn:pn:pvr:rvnIntelCorporation:rnDZ68DB:rvrAAG27985-104:cvn:ct3:cvr: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/956479/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
