In Intrepid rt kernel Dynamic Ticks support is still present (as you can
seen from kernel config file) but I have added a little patch that it
turned off by default (in generic it is on by default instead). Dynamic
ticks is a very useful feature for whom work with laptop and accept a
general
Bug moved to linux-rt
** Also affects: linux-rt (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-rt (Ubuntu Hardy)
Status: New = Invalid
** Changed in: linux-rt (Ubuntu Intrepid)
Assignee: (unassigned) = Alessio Igor Bogani (abogani)
Status: New =
It's my understanding that the -rt kernel for Intrepid is now handled by
the linux-meta-rt package maintained by Alessio. I'm adding a linux-
meta-rt task and marking the linux Intrepid nomination as Invalid.
However CONFIG_NO_HZ still looks to be enabled for the Intrepid -rt
kernel:
[EMAIL
Did it really need to be disabled in linux-generic as well, not just in
linux-rt? (Or is the changelog in update-manager just lying to me and
it didn't actually change in linux-2.6.24-19-generic??) (I'm on Hardy
x86)
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Latency regression with real time kernel and dynamic ticks feature
@Isaac
On my system CONFIG_NO_HZ is disabled only on linux-rt:
[EMAIL PROTECTED]:~$ grep NO_HZ /boot/config-2.6.24-19*
/boot/config-2.6.24-19-generic:CONFIG_NO_HZ=y
/boot/config-2.6.24-19-rt:# CONFIG_NO_HZ is not set
Exactly as should be.
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Latency regression with real time kernel and
Tim, please apply patch to intrepid as well.
** Changed in: linux (Ubuntu Intrepid)
Assignee: Alessio Igor Bogani (abogani) = Tim Gardner (timg-tpi)
Status: Confirmed = Fix Committed
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Latency regression with real time kernel and dynamic ticks feature
Copied to hardy-updates. The new kernel was tested extensively by many
people, who reported back in other bug reports. Due to lack of feedback,
this particular bug was not confirmed to be tested, though. Please
report back here if the bug still occurs for you with the new kernel
packages, then we
Accepted into -proposed, please test and give feedback here
** Changed in: linux (Ubuntu Hardy)
Status: New = Fix Committed
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Latency regression with real time kernel and dynamic ticks feature
https://bugs.launchpad.net/bugs/229499
You received this bug notification because you are a
SRU Justification:
Impact: That bug affect all rt kernel flavour users. From a realtime
point of view this is a severe regression.
Fix Description: To prevent this latency we need to disable Dynamic
Ticks.
Patch is very simple and safe (one line in rt kernel configuration):
