** CVE removed: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2010-4249
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Title:
Please enable CONFIG_TASK_DELAY_ACCT
To manage
Necromancing:
I'm not presently familiar with reputations of reporters, commenters or
triagers in this particular instance.
However as a data-point, a popular enterprise server distro latest current as
of writing (kernel-2.6.32-279.5.1.el6 amd64) enables 4 CONFIG_TASK kernel
options mentioned
I await any reply to the evidence that i have posted that
delayacct is faster enabled
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Title:
Please enable CONFIG_TASK_DELAY_ACCT
To manage
I have done a prelimiary test on harddrive speeds with delayacct
disabled ( the new default after the atrocity of it being removed) and
with it enabled...
The limted test script I created shows a clear winner:
on average delayacct is faster enabled.
I cannot explain this. I need someone else to
On Fri, May 4, 2012 at 5:20 AM, Balbir Singh bsinghar...@gmail.com wrote:
On Thu, May 3, 2012 at 11:59 PM, Christian Kujau
493...@bugs.launchpad.net wrote:
Whooha, language!
And I think they fixed it, albeit in a weird way:
CONFIG_TASK_DELAY_ACCT is enabled in the kernel config, but the
All of you are idiots. To disable an extremely valuable diagnostic
feature, because some idiot lies about a performance hit...
This kind of 'cut off thumb because it might slow typing down' blatant
atrocity , because a moron complains about performance hit, without
proof or numbers! This
Whooha, language!
And I think they fixed it, albeit in a weird way:
CONFIG_TASK_DELAY_ACCT is enabled in the kernel config, but the feature
is still disabled unless the kernel is booted with delayacct as a boot
parameter, see my comment above.
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On Thu, May 3, 2012 at 11:59 PM, Christian Kujau
493...@bugs.launchpad.net wrote:
Whooha, language!
And I think they fixed it, albeit in a weird way:
CONFIG_TASK_DELAY_ACCT is enabled in the kernel config, but the feature
is still disabled unless the kernel is booted with delayacct as a boot
In 10.04.2 linux-image-server depends on linux-image-generic-pae which in
turn depends on linux-image-2.6.32-21-generic-pae which has
TASK_DELAY_ACCT enabled.
However, be sure to pass delayacct to your boot options, otherwise it
won't work (sigh...)
Christian.
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I see that this has been fixed in the -generic kernel release; has there
been any discussion about doing the same for the -server kernel?
Thank you!
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This bug was fixed in the package linux - 2.6.32-28.55
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linux (2.6.32-28.55) lucid-proposed; urgency=low
* Another version bump because of abi check failure
* Tracking Bug
- LP: #699885
linux (2.6.32-28.54) lucid-proposed; urgency=low
* Another version bump because of
Here too: linux-image-2.6.32-28-generic (2.6.32-28.55) with 'delayacct'
running fine, iotop working too. Thanks!
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Title:
Please enable
** Branch linked: lp:ubuntu/lucid-proposed/linux-ec2
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Title:
Please enable CONFIG_TASK_DELAY_ACCT
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Verification done with 'delayacct' command line and linux-
image-2.6.32-28-generic (2.6.32-28.55).
** Tags added: verification-done
** Tags removed: verification-needed
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I see the new kernel packages (2.6.32-28.55), but linux-image-generic
still depends on linux-image-2.6.32-27-generic. Did someone forget to
update the linux-meta package?
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Accepted linux into lucid-proposed, the package will build now and be
available in a few hours. Please test and give feedback here. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Thank you in advance!
** Tags added: verification-needed
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Is there any reason to preserve the released behaviour of Lucid? Are
there situations where CONFIG_TASK_DELAY_ACCT has to be disabled?
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Title:
According to SRU policy no new features can be added to a kernel without
a feature exception. The other prime directive of the SRU policy is to
add no regressions. Given the amount of code that this config option
enables, I chose the path of least risk while still providing the
ability for savvy
Tim, If I understand your comment correctly, you're going to enable
CONFIG_TASK_DELAY_ACCT in the config but the actual delay accounting
will be disabled unless booted with delayacct? What happened to
Leann's RFC[0] and all the comments in this bug? Why introduce another
bootoption for that? What
** Also affects: iotop (Ubuntu Lucid)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Lucid)
Importance: Undecided
Status: New
** Changed in: iotop (Ubuntu Lucid)
Status: New = Invalid
** Changed in: linux (Ubuntu Lucid)
Status: New = Triaged
I've proposed a Lucid patch on kernel-t...@lists.ubuntu.com that will
enable CONFIG_TASK_DELAY_ACCT whilst preserving the released
functionality. You can enable delay accounting by adding 'delayacct' to
the kernel boot command.
** Changed in: linux (Ubuntu Natty)
Milestone: maverick-alpha-2 = None
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Title:
Please enable CONFIG_TASK_DELAY_ACCT
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** Changed in: linux (Ubuntu Lucid)
Status: In Progress = Fix Committed
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Title:
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Kernel team, do you agree with the regression potential described in
comment 20? If this imposes a performance degradation, it's not
appropriate for an SRU.
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In that case, what would be iotop for?
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On 22/09/10 17:36, Martin Pitt wrote:
Kernel team, do you agree with the regression potential described in
comment 20? If this imposes a performance degradation, it's not
appropriate for an SRU.
You mean, does the kernel team agree that (paraphrasing), There were
some unsubstantiated
Well, if we read the current status there's a fix released. Which
means yeas, we can! or Yeas, maybe we will, somewhere in the future.
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Subscribed ubuntu-sru. Hoping to see this fixed in Lucid as well.
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** Changed in: iotop (Ubuntu)
Status: New = Fix Released
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** Tags added: lucid maverick
** Tags removed: iotop
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SRU justification
IMPACT: Without this option enabled tools such as iotop are missing
functionality that is extremely useful for diagnosing performance
issues.
DEVELOPMENT BRANCH: The option CONFIG_TASK_DELAY_ACCT was enabled in
Mavericks kernel 2.6.35-5.6 without any reported regressions.
Please can a SRU be initiated to enable CONFIG_TASK_DELAY_ACCT in Lucid
given the LTS nature of Lucid. It's extremely useful to have full
statistics in iotop and in our server testing having this option enabled
has no noticeable performance hit.
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Thank you for taking the time to report this bug and helping to make
Ubuntu better. However, I am closing it because the bug has been fixed
in the latest development version of Ubuntu - Maverick Meerkat.
This is a significant bug in Ubuntu. If you need a fix for the bug in
previous versions of
The bug it's not fixed. It will as soon as Maverick will be released.
So, please, backport the fix to the current LTS release wich happens to be
Lucid.
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I re-opened this for discussion on the kernel-team mailing list:
https://lists.ubuntu.com/archives/kernel-team/2010-June/011238.html
The end result is that we'll enable this in Maverick. I'll try and get a
kernel uploaded today with this change. And as Tim notes in the mailnig list
thread,
Thanks!
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On Mon, Jun 21, 2010 at 1:22 PM, Leann Ogasawara
leann.ogasaw...@canonical.com wrote:
I re-opened this for discussion on the kernel-team mailing list:
https://lists.ubuntu.com/archives/kernel-team/2010-June/011238.html
The end result is that we'll enable this in
It was I who contacted Balbir Singh (which subsequently commented
here), Tim Gardner notes on the mailing list:
Actually, I was messing with this feature independently this morning. I
think our initial performance impact assumptions were a bit pessimistic.
Does that mean that there
Thanx :)
2010/6/21 Ævar Arnfjörð Bjarmason ava...@gmail.com
It was I who contacted Balbir Singh (which subsequently commented
here), Tim Gardner notes on the mailing list:
Actually, I was messing with this feature independently this morning. I
think our initial performance impact
This bug was fixed in the package linux - 2.6.35-5.6
---
linux (2.6.35-5.6) maverick; urgency=low
[ Amit Kucheria ]
* [Config] update omap flavour description
[ Andy Whitcroft ]
* update to ubuntu-debian:508b7aa34b578c0d1e51bfb571f2bfb824dc65ac
- LP: #570500, #576274
** Tags removed: lucid
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+1 on enabling CONFIG_TASK_DELAY_ACCT by default.
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Since all we have to reference as far as the purported performance hit
is Tim Gardner's post to the mailing list about a conversation where
Andy suggested there was a hit, yet we have upstream (thanks Balbir)
saying there should be no hit, I'd suggest that either Tim or his source
for this
If it is possible for programs like iotop to enable this feature only
when they are using it, then I would very much like to see this added.
Otherwise no, if it is going to cause a performance hit. Admins can
easily roll their own custom kernel if necessary.
--
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Can someone help characterize the performance hit with perf data or
oprofile data using a standard benchmark? When we developed the feature
we ran a large set of benchmarks to ensure there is no visible
performance hit. If there is a hit or a side-effect, I would be
interested in fixing it
Please reconsider enabling CONFIG_TASK_DELAY_ACCT. Just because there is
a slight penalty in some use cases doesn't motivate disabling it, when
iotop and possibly other valuable tools are not working as they should.
People that really need those extra milliseconds are usually better
equipped when
And really, you're going to force me to join a mailing list I have no
other interest in (and get flooded with the associated emails that are
of no interest to me), to lobby this issue that is clearly a bug, rather
than have it dealt with via the nominated means for users to report and
have bugs
** Also affects: iotop (Ubuntu)
Importance: Undecided
Status: New
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Can this bug please be reopened until the underlying problem (i.e., that
iotop does not work) is addressed? Simply stating that something is not
optimal does not address the functionality that is missing as a result.
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Considering this has been raised 4 separate times (besides bringing into
question people's searching skills), suggests this issue ought to be re-
examined.
If necessary, the accounting can be disabled by default as per
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/532490/comments/5
so as
Wow. I just came over from #532490 to see that bugs like these
(wishlist, really?) are being happily set to WONTFIX. I still fail
to understand the reasoning behind that decision and I hope this will be
revisited. Again:
- Iotop doesn't work properly w/o CONFIG_TASK_DELAY_ACCT
- There is no
Thanks for the link!
With this information Won't Fix seems reasonable. :-)
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Hi Hernando,
It seems discussion regarding this specific config option took place on
the kernel-team mailing list and it was decided to not enable this
option. Please re-raise the discussion on the kernel-team mailing list
if you'd like to pursue this further. Thanks.
** Tags added: lucid
** Tags removed: kernel-series-unknown
** Changed in: linux (Ubuntu)
Status: New = Triaged
** Changed in: linux (Ubuntu)
Importance: Undecided = Wishlist
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** Tags added: kernel-series-unknown
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