Now added a Wiki page to describe troubleshooting of this problem.
https://help.ubuntu.com/community/ReschedulingInterrupts
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
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Brandon,
Just to re-iterate things:
1. Rescheduling Interrupts are not necessarily a problem - they are just show
that the scheduler is working hard to distribute load across multiple cores to
keep the processors evenly load and keep overall CPU power down. The main issue
is if are they
Hello,
I use 2.6.24 on my T2300 dualcore laptop, with kubuntu hardy (without
opera), and also 2.6.24 on a PIII-3GHz with debian unstable. Note that I
do see Rescheduling Interrupts as well on my debian, but less often
and less intensive. Isn't this a pointer to that it's however a kernel
issue?
Hi Yves,
The rescheduling interrupts information was added into the kernel in the
main kernel in July 2007 ( http://lkml.org/lkml/2007/7/30/437 ) and I
believe it was not in the Gutsy kernel tree - so this activity was not
visible in user space and hence PowerTop would not be able to report it
Hi Colin, I did not know this, thanks for the information. I will try to
track down which program causes the wakeups
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Colin,
Thanks for your explanation. I ran cat /proc/interrupts
interrupts.log;sleep 60;cat /proc/interrupts interrupts.log a few
times. The system was idle with nothing but a few terminals open.
Let me know if this log helps.
Also, I tried running vmstat but am not exactly sure what I am
Brandon,
attached is my awk script to parse the interrupts.log file, to be run as
follows:
awk -f dualcore.awk interrupts.log
it calculates the number of interrupts a second you are getting over a
10 sample second period. From what I can see, you system looks fine and
is not suffering from the
Marking this as won't fix as the more significant outstanding issues
were resolved, namely:
1. Some issues causes by incorrect BIOS settings (see the case of Barteq's
issues)
2. Opera causes a lot of wakeups that causes a lot of legitimate rescheduling
interrupts - this is not a scheduler
Hi,
It's good to hear that things are more promising now.
The overall IRQ delta over 10 seconds (from your last results of
interrupts_normal_xorg.log) look more promising - IRQ 0 is definitely
not being saturated now, but it does appear that you system is busy
somewhere causing ~7K rescheduling
procs ---memory-- ---swap-- -io -system-- cpu
r b swpd free buff cache si sobibo in cs us sy id wa
0 0 0 2320476 38056 36609200 0 0 149 2951 2 2 95 0
0 0 0 2320272 38056 36609200 0 0 188
Hi again,
With that many context switched it may be worth running top in batch
mode to see which process(es) are causing this much activity:
top -b -d 10 -n 6
Colin
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
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It is Opera.. With no pages opened it looks like this;
procs ---memory-- ---swap-- -io -system-- cpu
r b swpd free buff cache si sobibo in cs us sy id wa
0 0 0 1088276 93032 154568000 0 0 79 129 3 0 97 0
0 0
Hi Barteq,
I suspected it would be some kind of killer app(!).
I think we can conclusively say that this is probably wrapped up now
with respect to a kernel issue. I suggest if you think Opera is
misbehaving by sucking all your power by over active wakeup calls then
you put a bug report against
For what it's worth, I upgraded to the 2.6.24-15 kernel that was
released in the Hardy Beta and I'm still getting about 50% of my wakeups
from kernel IPI : Rescheduling interrupts.
I can provide logs etc. if it would help. I've been trying to follow
the recent exchange between barteq and colin
Hi Barteq
IRQ 0 is really being hit excessively by something not behaving
correctly. Can you try adding the boot parameter acpi=noirq and seeing
if this helps reduce the excessive IRQ 0 interrupts?
Thanks. Colin.
--
Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
Barteq, ..just to add, here are the deltas of IRQ's on your system from
the last set of /proc/interrupts capture from your data.. showing a
worryingly high IRQ 0 hit.
CPU0 CPU1
0: 23573 23612 IO-APIC-edge timer
1: 558 562 IO-APIC-edge
Hi colin.
After adding acpi=noirq results are quite suprising. 1 digit wakeups from idle
in powertop is very good result, but there is no way to get into Xorg with this
settings. Nvidia drivers shows strange errors.
Please also look on dmesg. There is some kernel debug info..
Thanks,
Barteq
Hi Colin.
After adding acpi=noirq results are quite suprising. 1 digit wakeups from idle
in powertop is very good result, but there is no way to get into Xorg with this
settings. Nvidia drivers shows strange errors.
Please also look on dmesg. There is some kernel debug info..
Thanks,
Barteq
** Attachment added: dmesg_acpi_noirq.log
http://launchpadlibrarian.net/13163647/dmesg_acpi_noirq.log
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** Attachment added: Powertop result - usb modules unloaded + acpi=noirq
http://launchpadlibrarian.net/13163651/powertop_acpi_noirq_nousb.log
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Hi Barteq,
It appears that there may be some ACPI problems here with the IRQ setup
- booting with acpi=noirq definitely shows a far quieter system with
only a few hundred IRQs occurring over the 10 second sample periods. I
suggest now fulling booting your system using acpi=noirq and see if
this
Also, it may be worth consulting the following page for BIOS upgrades:
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-67989#changes
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Hi Colin.
BIOS upgrade was the very first thing I've made just after buing new
machine, so I've got a newest one.
As was said - I'm not able to fully boot up computer. Xorg is crashing with
strange nvidia driver errors. With nv or vesa driver screen is full of random
green bars from top up to
** Attachment added: dmidecode.log
http://launchpadlibrarian.net/13170465/dmidecode.log
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** Attachment added: acpi.tar.bz2
http://launchpadlibrarian.net/13170540/acpi.tar.bz2
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Hi Barteq,
This hardware issue is most curious. I am afraid I am going to ask some
more questions. I've seen reports of Ubuntu working fine on ThinkPad
T61's before, so I am a little perplexed by this not working well on
your laptop - perhaps it's the specific model of T61 that is causing
It's quite new machine, manufactured in february this year. Maybe there were
some minor changes in architeture without noticing anynone..
My model is 7664-RWU - (its specs -
http://www-307.ibm.com/pc/support/site.wss/quickPath.do?quickPathEntry=7664RWU
+ 2g ram more)
Bios update was made due
Some further investigation. Resetting bios to it's defaults was a good idea..
Don't know what exacly was changed but it improved many things..
Amount of wakeups without any special kernel parameters is quite low after
that. I've even managed to get under 16W boundary and made 15,4W with full
** Attachment added: powertop.log
http://launchpadlibrarian.net/13193341/powertop.log
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** Attachment added: Interrupts with acpi=noirq
http://launchpadlibrarian.net/13193609/interrupts_acpi_noirq.log
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Attached Interrupts on desktop full on with wifi active..
After some minutes there is still 1,5k interrupts without a reason, so problem
is definitely not gone.
Tomorrow will make some experiments with 7.10.. installer crashes on my laptop
with blank screen after xorg starts.. Have to download
Powertop on normal laptop session with xorg on and so
** Attachment added: powertop_xorg.log
http://launchpadlibrarian.net/13193918/powertop_xorg.log
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OK, Thanks for the additional information. Will re-examine this mode of
the problem.
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Hi Barteq,
A couple of things:
1. can you please attach the following information so that we can look
at this problem for your machine and configuration in more detail:
* uname -a uname-a.log
* cat /proc/version_signature version.log
* dmesg dmesg.log
* sudo lspci -vvnn lspci-vvnn.log
2.
Hi Colin. Thanks for reply. Here you are things you've asked me about.
There was a little glitch on single user mode - there are no C or P
states in powertop...
Please also notice that these 50k wakeups occurs randomly, usually after
some time.
** Attachment added: dmesg.log
** Attachment added: lspci-vvnn.log
http://launchpadlibrarian.net/13151384/lspci-vvnn.log
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** Attachment added: version.log
http://launchpadlibrarian.net/13151397/version.log
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** Attachment added: powertop.log
http://launchpadlibrarian.net/13151389/powertop.log
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Hi Barteq,
Thanks for the information - after my initial look, I suggest a couple
more bits of information to help me corner this:
Can you again reboot into single user mode and do the following:
cat /proc/interrupts; sleep 60; cat /proc/interrupts interrupts.log
and repeat this about 5 times
** Attachment added: interrupts.log
http://launchpadlibrarian.net/13154676/interrupts.log
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It very sad turnout. There was no rescheduling in earlier kernels
(feisty, gutsy) and minimal achievable power consumption was 2W lower
than now. I could go down to about 12W on idle on my laptop. With
current hardy I couldn't get lower tha 14.3W, even with SATA link
powermanagement on, with
@Colin King
It isn't made by any kind of software.. It's a pure kernel/hardware issue..
Please look here http://www.bughost.org/pipermail/power/2008-March/001327.html
I've subbmited this problem on powertop mailing list, but there are no
conclusions.. The only thing that was noticed is that I
Why is this bug marked as 'medium' importance? It looks like everybody with a
notebook with more than 1 core is affected. I guess this has to be marked
critical...
Can you (the owner of the bug) please change this?
Or is there a reason to leave it with lower importance?
--
Kernel 2.6.24-2
I'm afraid that critical is reserved for serious things like data loss
or security issues.
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Oh, I understand, so it is not 'critical', if you are considering ubuntu
as a server OS. However, if it is to be used on notebooks, then burning
battery when it's not needed, actually reducing battery's life to 1/2 or
2/3 should be considered a very serious issue.
--
Kernel 2.6.24-2 causing
Hi,
I will try to draw some clarity on this issue with respect to the
rescheduling interrupts issue. I've been looking at various scheduler
patches upstream and been devoting time to try to corner this issue.
From my analysis, some level of rescheduling interrupts due to IPI
events will occur on
Hi,
I will try to draw some clarity on this issue with respect to the
rescheduling interrupts issue. I've been looking at various scheduler
patches upstream and been devoting time to try to corner this issue.
From my analysis, some level of rescheduling interrupts due to IPI
events will occur on
Oh.. one more thing to add:
When running PowerTop, be sure to give it several minutes run-in before
believing the power consumption figures. I've noticed it only seems to
give me believable power consumption figures after about 10 minutes of
use - its first estimates are quite wildly out but get
OK, but how about the load oscillating between two cores (not two cores
running simultaneously splitting the load at lower C/P state - but
instad one core at full steam while the other one is idle - then the
same load swapping to the other core with the first one nearly idle and
so on... It is not
And thank you very much Colin King for taking a serious look into this
matter !
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I'm having the same issue on my Thinkpad x60 tablet. kernel IPI is
taking about 53% of wakeups with rescheduling interrupts.
Ugh.
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According to http://www.bughost.org/pipermail/power/2007-December/001189.html
the problem will disapear if the jiffie-rounding patch is applied.
Lets get it tested!
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I'm experiencing the same issue on my dell xps m1330 and the workaround
of disabling smp in bios seems to work for me as well.
Since Hardy beta (x86_64) I'm also noticing a great increase in the fan
activity despite the bios version having been the same since Gutsy. Do
you think this bug is the
It seems to me that it has something to do with it. My HP nc8430 laptop
is too warm to be held on my lap with Hardy. The fan is constantly on
and quite loud, although not on maximum blast. It seems also that the
processor is oscillating tasks between the cores constantly (even when
the computer is
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Try switching back to 2.6.24-10-generic or 2.6.24-8-generic, as I also
noticed that -12 uses more power.
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It's getting massive. Number of wakeups goes up to 50k
Now, my laptop is useleess. Being totally idle with Wifi turned on and
backlight on the lowest level, laptop consumes 25 Watts (!) of energy, instead
of about ~16W which was noticed on previous distribution (gutsy). It's close to
10W
same here on 2.6.24-12-generic...
Rescheduling interrupts differs from minimum 10 wakeups up to 3000.
About taking cpu offline please read here at the very bottom -
http://www.lesswatts.org/tips/misc.php
It actually makes power consumption bigger.
--
Kernel 2.6.24-2 causing ~1000 wakeups by
Sorry for writing response to my own post but it's technologically
impossible to edit previous one. So here is my powertop while idle (with
some applets running: sensors, backlight, power, cpufreq-utlis, nm-
applet + opera and firefox in background)
Additional ondemand governor makes my cpu jump
In most of cases TouchPad always on the top too,
90,7% (2086,5) kernel IPI : Rescheduling interrupts
2,6% ( 60,3) interrupt : PS/2 keyboard/mouse/touchpad
This bug is not affected by this bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/148205 ?
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Kernel 2.6.24-2 causing ~1000
Yep, couse I've touched it some times while acquiring data. Here is
powertop result without touching anything:
Top causes for wakeups:
95,9% (3764,1) kernel IPI : Rescheduling interrupts
1,4% ( 55,5) interrupt : acpi
0,8% ( 31,7) interrupt : extra timer interrupt
I get this on Alpha 6, cpu (T/200) is constantly staying over 50% of time in c0
state pecause of these Kernel IPI Rescheduling interrupts.
What is interesting is that it starts when using Nautilus : checking the
filesystem - properties : the contents (and size) keep getting larger and
larger
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Status: Triaged = In Progress
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Being bold.
** Changed in: linux (Ubuntu)
Status: Fix Released = New
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I have only running at this time firefox with one Tab and totem playing
some MP4 audiobook`s
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Same here
using :
Intel core 2 duo T5200
Linux clbr 2.6.24-11-generic #1 SMP Fri Feb 29 22:08:31 UTC 2008 i686 GNU/Linux
PowerTOP version 1.9 (C) 2007 Intel Corporation
CnAvg residency P-states (frequencies)
C0 (cpu running)(12.4%) 1.60 Ghz
same here: Dell D630 Core2 Duo 2 GHz with hardy alpha 6 and kernel
2.6.24-12.20-i386
Wakeups-from-idle per second : 5426,0 interval: 3,0s
Power usage (5 minute ACPI estimate) : 0,0 W (1602,1 hours left)
Top causes for wakeups:
33,9% (155,3) kernel IPI : Rescheduling interrupts
I have the same problem. I use a macbook core duo first generation.
The kernel 2.6.24-8.14 uses a lot of power,
powertop shows kernel IPI : Rescheduling interrupts doing ~300/500
wakeups on idle.
When not idle it goes up to 6000 - 1 wakeups
There is also a usb device 4-1 that makes 100
This is still/is again a problem with 2.6.24-11.17. The system is
essentially idle, but I get 400-600 wakeups per second thanks to
Rescheduling interrupts.
See http://lkml.org/lkml/2008/1/21/339 for further analysis.
--
Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
With 2.4.24.8 the situation improves again:
36,5% ( 69,0) interrupt : [EMAIL PROTECTED]::00:02.0
16,0% ( 30,2) kernel IPI : Rescheduling interrupts
15,9% ( 30,0) Xorg : schedule_timeout (process_timeout)
5,8% ( 11,0) /usr/bin/condui : schedule_timeout
Guillermo Perez wrote:
I forgot to say that this is on a Dell D830. And the battery runtime has
improved a lot anyway from gutsy - hardy (from 3.5 hours to almost 5 hours!)
With the tickless kernel setting (CONFIG_NO_HZ) being set in 2.4.24.8,
one should also see (small) power savings because
Its possible that the CPU does not sleep properly with one CPU offline (
Just a thought ).
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Ubuntu-2.6.24-8.13
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Status: Fix Committed = Fix Released
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If you want to totally turn off extraneous cpu cores, one can actually
do the following:
echo 0 /sys/devices/system/cpu/cpu1/online
This only applies for cores 1..N-1 on a N core machine, i.e. you cannot
turn core 0 off. This will then turn off any Rescheduling Interrupts
since there is only 1
This is very strange.
After disabling cpu1 the wakeups-from-idle per second drops from ~31000
to ~250, and the kernel IPI : Rescheduling interrupts disappears from
the output of the powertop.
But the power consumption actually increases. It goes from 22.8W while
idling with 2 cores activated to
I tried to put 3100 not 31000 wakeups :)
And I have noticed that the counter is clearly broken. The total says 3081 but
summing-up the wakeups from the list should be closer to 430. Kernel IPI is the
top cause with 166 wakeups, 38% of the total. Why the hell says 3081 is the
total?
On Thursday 14 February 2008 20:58:21 Guillermo Pérez wrote:
And I have noticed that the counter is clearly broken. The total says 3081
but summing-up the wakeups from the list should be closer to 430. Kernel
IPI is the top cause with 166 wakeups, 38% of the total. Why the hell says
3081 is
Enabled the CONFIG_SCHED_MC option to allow multi-core scheduling for
i386, ia64 and sparc (it is already enabled for x86_64) to allow one to
turn on multi core power savings by:
echo 1 /sys/devices/system/cpu/sched_mc_power_savings
Although grep CONFIG_SCHED_MC /boot/config-2.6.24-5-generic
Hi,
System is completly idle:
[EMAIL PROTECTED]:/# grep CONFIG_SCHED_MC /boot/config-2.6.24-5-generic
CONFIG_SCHED_MC=y
[EMAIL PROTECTED]:~# echo 1 /sys/devices/system/cpu/sched_mc_power_savings
[EMAIL PROTECTED]:/sys/devices/system/cpu# cat sched_mc_power_savings
1
Powertop Screenshot:
Enabling multi core power savings could help:
echo 1 /sys/devices/system/cpu/sched_mc_power_savings
This minimize the number of cores being loaded and hopefully enable idle cores
to drop into lower power states. However my
tests show that the savings may be marginal.
The
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Problem persists with 2.6.24-4 Kernel.
But somehow it uses less Battery... Screenshot is with 3G Data Card and
Music playing, with the old 2.6.22 it took about 20-22W in this
state... interesting... I wonder how much Battery it will take with
less wakeups.
Screenshot:
PowerTOP version 1.9
On Ubuntu hardy
Kernel: Linux fenix 2.6.24-4-generic #1 SMP Mon Jan 14 17:30:39 UTC 2008 i686
GNU/Linux
powertop output (after following all sugerences):
CnAvg residency P-states (frequencies)
C0 (cpu running)(25.7%) 2.21 Ghz15.4%
C1
confirming on dell latitude d820, with a coreduo chip.
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** Attachment added: lspci-vvnn.log
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output of powertop. forefox-3 nvidia are the only competitors to
Rescheduling interrupts for Worst Power Hog Award. battery life on this
machine is down to a shocking 1.3 hours, with wireless, bluetooth and
even usb turned off.
CnAvg residency P-states (frequencies)
C0
** Attachment added: dmesg.log
http://launchpadlibrarian.net/11455922/dmesg.log
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
https://bugs.launchpad.net/bugs/177895
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Bugs, which is the bug contact
This [1] might have some relation to this bug.
[1] http://www.bughost.org/pipermail/power/2007-December/001188.html
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
https://bugs.launchpad.net/bugs/177895
You received this bug notification because you are a member of Ubuntu
Confirming on Dell Latitude D830
** Attachment added: dmesg.log
http://launchpadlibrarian.net/11319626/dmesg.log
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
https://bugs.launchpad.net/bugs/177895
You received this bug notification because you are a member of Ubuntu
** Attachment added: lspci-vvnn.log
http://launchpadlibrarian.net/11319628/lspci-vvnn.log
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
https://bugs.launchpad.net/bugs/177895
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug
** Attachment added: uname-a.log
http://launchpadlibrarian.net/11319630/uname-a.log
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
https://bugs.launchpad.net/bugs/177895
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact
** Attachment added: version.log
http://launchpadlibrarian.net/11319632/version.log
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
https://bugs.launchpad.net/bugs/177895
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact
Anyone tried Kernel linux-image-2.6.24-3-generic?
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Kernel 2.6.24-2 causing ~1000 wakeups by Rescheduling Interrupts
https://bugs.launchpad.net/bugs/177895
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact for Ubuntu.
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ubuntu-bugs mailing
On Sunday 13 January 2008 21:43:41 robe wrote:
Anyone tried Kernel linux-image-2.6.24-3-generic?
Yes, I have not quite as many (300-400 now) as before, but then again, I never
quite reached 1000 wake ups before (more like 500-600), either.
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Kernel 2.6.24-2 causing ~1000 wakeups by
I confirm this on Lenovo Thinkpad x61s with Core2Duo. I have now 530
wakeups/sec, of which 34% rescheduling interrupts and 17% PS/2
keyboard/mouse/touchpad. Attaching required files as well.
** Attachment added: uname-a.log
http://launchpadlibrarian.net/11146857/uname-a.log
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