I meant to add in comment 100.
I am most certainly not saying that the linux-ec2 kernel running on EC2
is flawless, nor am I saying that -virtual is flawless, but the high
load in /proc/loadavg was fixed.
If you have other issues, with current images, please open bugs.
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This bug is "Invalid" on "Ubuntu on EC2" where invalid means "not the
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The Ubuntu project bug, open against the 'linux' package is marked
'Fixed Released'. See comment 93.
>From the bug summary, i
Which actual AKI is this bug against and is it occurring with the latest images?
Maybe it doesn't exist anymore in the latest with pvgrub AKI and AMI?
Does LTS mean anything here?
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Why marked invalid, was this fixed?
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High load averages on Lucid while idling
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** Changed in: ubuntu-on-ec2
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Hi - another person reporting in.. spent a couple days trying to
troubleshoot what could possibly be bottlenecking our system to report
such a high load. Finally found that it is a known bug.
It looks like the fix is almost ready?
> uname -a
Linux ip-###.##-ec2 #9-Ubuntu SMP Thu Apr 15 08:05:38
this bug affects others
-
High load average on Ubuntu 10.04 ...( 64 bit )
- Ubuntu 10.04 (64bit)
- Linux kernel 2.6.32-30
- Gnome 2.30.2
-
Is this fix present in 2.6.32-312-ec2? I'm seeing high loads on machines
doing almost nothing after upgrading to the grub kernel (thanks for
that, BTW!), and then -312.
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When will be this fix released for x64 server kernel? I updated server
~week ago (kernel 2.6.32-25-server) and fix still isn't there.
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This was fix-released in linux-image-2.6.32-309-ec2 .
That kernel is the default in uec images with serial 20101020.
https://lists.ubuntu.com/archives/ubuntu-cloud/2010-October/000307.html
** Changed in: linux-ec2 (Ubuntu)
Status: In Progress => Fix Released
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I also confirm the new kernels fix the bug. Thanks Scott!
Users keep in mind, that for existing images, you'll need to install the
corresponding kernel modules (a reboot will usually kernel panic if they do not
exist).
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I ran ami-6407f20d (ubuntu-lucid-10.04-i386-server-20100923) with kernel
aki-a2c236cb, and in almost an hour, the highest load shown is a spike
to .15.
I consider this bug fixed in the -proposed kernel.
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I've uploaded kernels to the following akis. Please test these (from
lucid-proposed) and report back.
x86_64 ubuntu-lucid-amd64-linux-image-2.6.32-309-ec2-v-2.6.32-309.17-kernel.img
us-west-1 aki-70065635
us-east-1 aki-acc236c5
eu-west-1 aki-8c4174f8
ap-southeast-1 aki-320d7360
i386 ubuntu
** Branch linked: lp:ubuntu/lucid-proposed/linux-ec2
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@Rod
The latest kernel attached to the latest set of images does not contain a fix
for this bug.
The kernel team is working on getting this fix [1] pulled in and uploaded to
-proposed, hopefully early this week. At that point, this bug will have an
automatic comment added to it indicating
My latest on this is that I haven't really had a problem since my last
post here. Eric's suggestion to add an explicit XFS unfreeze after my
regular snapshots may have fixed some of my load spike / lockup
problems, even though it happened once soon after I added the unfreeze
(as per my post above)
John,
I'm so frustrated with this that I'd be happy to try anything, including
however many test kernels you throw at me.
I'm curious though -- If you start up an EC2 instance of your own are
you not seeing this behavior? After noticing the latest AMI release I
decided I should try spinning up
** Changed in: linux-meta (Ubuntu)
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Hello folks,
just want to clarify, this might shed some light on my problem so I'm
sharing it here.
My Lucid system was in fact upgraded from a Karmic install on EC2, so
the kernel that is running there is 2.6.31-302-ec2, the one distributed
with Karmic. All the system was upgraded to Lucid, but
The just of it is this. Enterprise cloud stuff goes here. Everyone
else in to the pool I just created unless there is a better one out
there.
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I created bug id #635181
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Alex,
I appreciate both your frustration and your desire to help, the Lucid
kernel has seen literally hundreds of patches since release (see
https://edge.launchpad.net/ubuntu/+source/linux/2.6.32-25.43) for just
the latest round of updates for the proposed kernel and more are already
on the way.
James,
thankyou for the report. Is there anymore data you can provide from the
box that spiraled out of control?
Also the Maverick report is interesting are you will to run a couple
test kernels that I have if I make them available?
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asasoft,
I'll give you that Bug #524281 can and does affect load, however it
certainly not the only issue that affects load, and it doesn't result in
quite the same random phantom loads I was seeing. Unfortunately one
persons phantom loads are different than another. I address one
particular bug
There are a lot of users here echoing my sentiments.
I appreciate there is a way to file bugs and that Ubuntu addresses them
per that policy. What you have is quite a significant number of users
saying the Lucid Lynx kernel is flat out broken.
I specifically tagged this bug to 'linux' (more gener
Just echoing what others are saying here. This bug is definitely not
resolved, I reported one of the original bugs (#575193) and just got a
chance to try out the new lucid AMIs.
After the machine was up for two days load spiraled out of control until
we had to shut it down due to unresponsiveness
@John Johansen
"Outside of EC2 the high load average for an idle machine hasn't been generally
reported as a problem"
John I think this is the same as Bug #524281 , already mentioned in
comment 15
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@john that does seem to look like my issue. I had that behavior, but
never saw any iowait.
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Rod, Alexandre, Matthew: your problem maybe at least partially related
to Bug #585092, which is actually a little more generic than just
umount.
Chris, something certainly isn't right with your system, but the fix from this
bug isn't going to help you as it only applied to the -ec2 kernel. Outsi
After installing all of the most recent updates. Then fixing the
botched patch roll out so that I could boot the system again. I still
have wretched load averages. My host, violet 2.6.32-24-generic
#42-Ubuntu SMP, is still experiencing load averages of > 1 after a
reboot and waiting 5 min for i
My problems are similar to those of Rod, straight unresponsiveness
including high loads in some intermitent moments.
If anyone is looking for a solution to such a problem, they'll probably
be driven to this thread. So should we open another bug and restart the
conversation ?
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No-go. I just had it happen again! This time it was at 45 mins past the hour so
nowhere near my snapshot time. System was so unresponsive that it kicked me off
my ssh session. I tried a forced instance restart and once I did that I could
suddenly log in again even though it didn't restart, was s
Quite possible Eric, will try the explicit unfreeze and see if it makes
a difference. Thanks for that!
The summary from me is that the underlying high load average bug has
been properly fixed for me since using the new kernel. My only remaining
problem is this load spike issue, if it turns out to
Rod: I think you are probably experiencing something completely
unrelated to the bug identified in this launchpad report. It might be
worth moving the conversation to a different bug or a different venue.
If you are using ec2-consistent-snapshot to initiate your EBS snapshots
(freezing an XFS file
I didn't mean to imply that the occasional unresponsiveness was fixed by using
the new test kernel, it was more of a hope. That hope was dashed a few days
ago, while I was not around we experienced another spike that lasted for 1h 10
minutes during which the system was effectively externally unr
I have some Chef recipes that install nginx, ejabberd, monit, postfix
and some ruby applications on a 32 bit system. I ran them on the latest
Lucid image and the load went back to 12. I moved to Karmic and the load
is 0. Unfortunately I need to release so I will just stay with Karmic
until Maverick
I've been experiencing times of high load reported when the machine is
otherwise idle. I've also been experiencing sudden spikes in load (40+)
when the machine is doing minimal work (CPU 50% idle), few processes
running.
Is anybody able to confirm whether or not the fix from 20100827 solves
these
I've been putting up with the high load averages for a few months now on our
production system. I've also been experiencing what I thought was an unrelated
problem but I've come to suspect is tied up with this bug: every now and again
the system would appear to lock up and become unresponsive bu
When we switched to Lucid we had load averages go from 0.01, to 20+ and
periods of time where the system would become unresponsive. Having
moved back to Karmic with the same code base rebuilt on Karmic, load
averages are back down. Our work load is heavy IO bound, both network
and disk.
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Matthew,
What kind of work loads are you running, that may help us track down your
issue.
Al,
sorry to hear that, note the code that causes the load average bug is now
upstream so you may run into on any newer kernel if it has been built with
CONFIG_NOHZ (tickless). We are still looking in
@John Johansen,
The new test kernel seems to have fixed the phantom load average bug for
me. Here's two instances of my web server sitting idle:
#1) Ubuntu 10.04 32-bit AMI with default kernel:
up 1:22, 1 user, load average: 1.03, 1.02, 0.93
#2) Same AMI with new test kernel (aki-84b75ded):
u
Just as a follow-on to my comment in #58.
It's unlikely I'll be able to test this as we've now migrated everything
away to a different distribution, so unfortunately I won't get a chance
to try any new kernels.
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Lucid is still unusable on EC2 due to some real load issue. I still do
not have time to properly help debug this, so for me to open other
tickets won't be much help.
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Just to be clear,
The test kernel mentioned above fixes a bug with the way load is
calculated on the -EC2 kernels in Lucid. The fix reverts a patch that
was applied to Lucid for a different load accounting bug for tickless
kernels. However the -EC2 kernels are not tickless and as such the
accoun
I am really eager to re-run my chef cookbooks on top of this fixed
image. Where can we track the progress of the new EC2 AMIs?
Marius
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I have submitted the fix for SRU and once it makes it through the SRU
process we will have a new kernel.
The fix is based on the patch in the test kernel previously posted and
specifically addresses the phantom load reported in this bug. It does
not address any other issue. If you are still expe
** Description changed:
+ SRU Justification:
+
+ Impact:
+ Fixes loadavg reporting on EC2.
+
+ Fix:
+ This reverts commit 0d843425672f4d2dc99b9004409aae503ef4d39f which fixes
a bug in load
+ accounting when a tickless (no idle HZ) kernel is used. However the Xen
pa
I might give it a shot when I get some spare time next week.
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Al, just before you posted about your lock-up, an instance of mine (not running
one of these test kernels) was experiencing some difficulty in a US-EAST-1
availability zone, I think related to EBS, it had trouble accepting connections
and running new processes for about 15 minutes and was magica
It was an AMI of our application which is based on the standard 10.04
LTS AMI and adds Tomcat6, Apache2, and PostgreSQL, and Suns Java 6 JDK.
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Al,
which AMI where you using?
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It's been about 40 mins now and the end of the log for the instance just
reads;
init: plymouth main process (45) killed by SEGV signal
cloud-init running: Fri, 13 Aug 2010 09:41:23 +. up 3.64 seconds
mountall: Disconnected from Plymouth
init: ureadahead-other main process (322) terminated wit
@Al: If you reboot it from the AWS console, updated system logs should
show up 2-5 minutes later. Normally they have info on kernel panics and
other badness.
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I tried the aki-84b75ded kernel on an EC2 instance running our AMI and
it locked up within 10 mins.
There's nothing in the EC2 system log to indicate why, and the instance
became completely unresponsive to outside world so I couldn't use an
existing session to look at the system logs.
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i386 kernels from jjohansen's kernel build of 2.6.32-308.14 are available now.
ubuntu-lucid-i386-linux-image-2.6.32-308-ec2-v-2.6.32-308.14-kernel
at:
us-west-1 aki-92c594d7
us-east-1 aki-84b75ded
eu-west-1 aki-e6d5ff92
ap-southeast-1 aki-af3f41fd
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i386 would really be appreciated! thanks
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Can you roll some 32 bit ones as well, we tend to use m1.small EC2
instances so I'd like to test in that environment
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I have 50 minutes of log from an otherwise idle instance running ubuntu-
lucid-10.04-amd64-server-20100427.1 on aki-c8b258a1.
$ while read loadavg < /proc/loadavg && echo "$(date): ${loadavg}" &&
sleep 10 ; do : ; done
that shows highest load of 0.08 for a 1 minute period (the first field)
and no
There is a set of new test kernels for x86_64, if anyone is interested I
can build them for i386 as well
us-west-1 aki-06c59443
us-east-1 aki-c8b258a1
eu-west-1 aki-c0d4feb4
ap-southeast-1 aki-d13f4183
This kernel has so far been doing better for me. This does not mean you
won'
Chris,
thanks for your comments and understanding, I am not going to speak
particularly to tarnished image or how ready the 10.04 LTS was, I think
those are some what relative. I can completely understand that bugs can
be a W T F moment, and cause sever problems for some of our users. The
fact i
Al, John:
Thanks for the information.I understand that people are trying to be
helpful by posting the links on how load average is calculated. Using
this information is like trying to back calculate interest, principal
and term based on the last payment in an amortization schedule. If the
*t
So just some updates.
Yes the code for calculating load averages has been checked and
compared. Testing has been done to isolate where the bug is and Lucid
without the Xen patchset is not exhibiting this behavior. I have been
working towards a test kernel with an updated Xen patch set, hopefully
@Alex
Maybe if the Ubuntu Cloud page didn't say;
"Amazon EC2 fits perfectly with Ubuntu Enterprise Cloud's modularity,
virtualisation capabilities, range of applications and optimised
performance."
people wouldn't get so passionate.
http://www.ubuntu.com/cloud sets expectations of "optimised pe
I've spoken with John on IRC and the team are perfectly aware there is a
problem. This is not in dispute.
It takes time to track down these problems, and the time of a kernel
developer is in high demand. I seriously doubt this is the only
'serious' bug affecting a decent number of users which is b
@Chris
Thats not what I said at all. If you know how the load average is calculated,
then you can look at what it is calculated from and then troubleshoot why the
values are high. Work out the source of the bad performance. Do we actually
know what this is yet?
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** Changed in: pantheon
Importance: Critical => Medium
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Load average is just a number. Aside from your "accounting errors"
there are fundamental performance issues. How they relate I do not
know. Since none of the "usual suspects" except for load average show
up as issues (disk i/o, network i/o, memory swapping, etc) for me to
troubleshoot (or kill
Has anyone looked at Ubuntu's code where the actual load average is calculated?
If so where is this? Perhaps we should start from there, see
http://en.wikipedia.org/wiki/Load_(computing)#Unix-style_load_calculation
Testing is great, but we have already verified the incorrect averages.
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Jonas thank you for that information.
I am aware of the resources to track down high load average. I have
iftop/iotop/top/vmstat/iostat and sar installed. The article fails to
mention vmstat and SAR at all. Iftop/top/iotop are useful only in that
they all report that nothing is "hogging" the
Hack and / - Linux Troubleshooting, Part I: High Load
by Kyle Rankin
Linux Journal
http://www.linuxjournal.com/magazine/hack-and-linux-troubleshooting-
part-i-high-load
Just another resource for how to diagnose a high load on linux.
James Jonas
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IMHO, if the problem is exhibited without the EC2 code, then the EC2
code is just that much less code to interact with while debugging this
issue. The act of 'adding it back in' is a distraction (more or less)
at this point and effort should be placed on tracking down the high
load average issue.
Same issue here, but maybe some intresting additionals.
My note running 10.04 installed from CD (07.01), updated every time daily.
Configuration: Dell Latitude E5400 4GB RAM, 2.5Ghz CPU, 250 GB HDD, 2 pcs ext4
fs, running sweet without any high load issue...
This note has few installed Virtualbo
Scott, thanks for the update. As always I appreciate an open an honest
answer.
I can understand you can't predict how long it will take to fix the bug,
but similarly we can't tell how long customers will continue to use the
degraded service that is the best we could offer under 10.04 LTS, hence
th
On Mon, 2 Aug 2010, Al Sutton wrote:
> Can we have an update to confirm that;
>
> a) It's been agreed it's not "simply an accounting/reporting problem.",
> and is something that impacts performance
The ec2 issue definitely appears to not be simply accounting. Many of the
comments on this bug are
Can we have an update to confirm that;
a) It's been agreed it's not "simply an accounting/reporting problem.",
and is something that impacts performance
and
b) Details of whats being done to fix it
So people, like myself, who are waiting for this to be resolved in order
to switch back to 10.04
I should add: Note the change in kernel for my work host from my post
on 7/27 to the one on 7/29. There is an improvement in retrograding
kernels but it is still not like the 9.10 release.
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Not that this will do much to track down the issue, but I have some more
case history.
Today I was tidying up some vdi disks on my host system (work system
running 10.04 w/ 2.6.31-17 on Core2 Duo E6750 2.66GHz 4GB ram). A disk
to disk (two physical disks) copy of a 7.5GB vdi caused the load aver
** Changed in: pantheon
Status: Triaged => Confirmed
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Importance: Medium => Critical
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> John is working on trying to get this fixed. We believe, at this
point, that it is simply an accounting/reporting problem.
In a word: NO.
With 10.04 as the base OS on the host and in a VB-vm the load average
issues are tantamount to making the distribution unusable as shipped and
only margina
I unfortunately do not have the cycles currently to properly help debug
this, but can only say we had significant load and performance issues
with Lucid, that we did not have with Intrepid, nor do we have with
Karmic(that we had to fall back to).
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That sounds unrelated to this bug and may be an issue with your software
workload. I'm not seeing any fluctuation in memory usage beyond the fact
it uses 15-20x more than a Karmic Koala kernel upon initial boot up.
Are you able to post diagnostic output showing this isn't your workload
causing the
I have the same problems. My load increases (to some really scary
values, even as high as 45), and the number of processes too, and at
some point, my MySQL server is being killed (but not always). I don't
think it's just a reporting problem.
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Thanks for the update. The performance of the EC2 10.04 images is
noticeably slower than the 8.04 LTS ones we were running, so I'm pretty
sure it's not just a case of the load being incorrectly reported, hence
why I've been actively monitoring this issue.
Given what you've said it seems unlikely t
On Tue, 27 Jul 2010, Al Sutton wrote:
> John; Just so I'm clear, are you saying it's not going to be fixed until
> 10.04.1 LTS (i.e. a few weeks away), or are we looking at several months
> until 10.04.2?
10.04.1 is weeks away. It is not likely that a fix for this would make
the cutoff for 10.04
John; Just so I'm clear, are you saying it's not going to be fixed until
10.04.1 LTS (i.e. a few weeks away), or are we looking at several months
until 10.04.2?
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Alex, I didn't expect it would make much of a difference either but was
willing to try if for no other reason to rule it out.
Al, the issue will persist until at least the next point release.
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LTS only really applies to people that pay Canonical for support i.e. they only
support LTS.
Ubuntu also does not release bug fixes in package updates during a release.
This basically means that LTS is worthless to the community and quite a big
misnomer.
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I too have problems with high load averages on "unloaded" systems. For
a while I thought this was due to my running Ubuntu Lucid under
Virtualbox. One of my hosts (violet) is a Virtuabox VM
w/2.6.32-24-generic #38-Ubuntu SMP running. It has Firefox 3.6, Pigeon
and a terminal window open .
to
For reference; I've just updated to linux-image-2.6.32-308-ec2 and the
issue still persists.
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Please note, as mentioned, I see exactly the same scheduler behaviour on
my hardware with Karmic Koala - downgrading from the Lucid Lynx kernel
fixes all my other issues though. Thus I'm not sure this is the actual
problem.
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The bug isn't being ignored, but you are correct there is now official
patch or solution to the problem.
I am currently looking at building test kernels, which will include the
scheduler patch referenced in
https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/524281
this will let us det
This is getting silly. I currently have 2 Amazon EC2 instances running
10.04 LTS, both of which sit at around 1.0 load and can go to 4, and
that's only serving a few users. They were "upgraded" from 8.04 LTS
where the load rarely went above 0.5.
I'm guessing as this hasn't been resolved for nearly
Another bug over here is receiving more attention, and seems potentially
linked --
https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/524281
At the moment the only solution I've got is to revert to a Karmic Koala
kernel, which is hardly ideal. Is there a reason this bug isn't
receiving
** Also affects: linux
Importance: Undecided
Status: New
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I'm running into the same issues on the Lucid 64bit EBS AMI, except with
much higher load:
$ uptime
18:06:22 up 18:31, 2 users, load average: 12.16, 13.54, 13.78
$ top -bn1 | head -20
top - 18:06:52 up 18:32, 2 users, load average: 11.53, 13.19, 13.65
Tasks: 108 total, 1 running, 107 slee
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