I wonder if this fix fell out or is somehow different now?
The below script, on 4.11rc7:
1cpu: 0m1.379s
12cpu: 1m36.556s
72cpu: 2m20.118s
This is a *huge* impact for neutron L3 agent on my OpenStack system.
# cd /tmp
# ip netns add foo
# ip netns add bar
# for i in `seq 0 1000` ; do echo -e
@gnanasekarkas. Not that we know of.
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Title:
Kernel network namespace performance regression during rcu development
on kernels
Do we have this bug on Kernel 4.4.0-67-generic on Trusty release?
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Title:
Kernel network namespace performance regression during
** Changed in: linux (Ubuntu Trusty)
Assignee: (unassigned) => Rafael David Tinoco (inaddy)
** Changed in: linux (Ubuntu Utopic)
Assignee: (unassigned) => Rafael David Tinoco (inaddy)
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** Changed in: linux (Ubuntu)
Assignee: (unassigned) = Rafael David Tinoco (inaddy)
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Title:
Kernel network namespace
** Changed in: linux
Assignee: Rafael David Tinoco (inaddy) = (unassigned)
** Changed in: linux (Ubuntu Trusty)
Assignee: Rafael David Tinoco (inaddy) = (unassigned)
** No longer affects: linux
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** Tags added: cts
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Title:
Kernel network namespace performance regression during rcu development
on kernels above 3.8
Status in
This bug was fixed in the package linux - 3.13.0-36.63
---
linux (3.13.0-36.63) trusty; urgency=low
[ Joseph Salisbury ]
* Release Tracking Bug
- LP: #1365052
[ Feng Kan ]
* SAUCE: (no-up) irqchip:gic: change access of gicc_ctrl register to read
modify write.
-
** Branch linked: lp:ubuntu/precise-security/linux-lts-trusty
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Title:
Kernel network namespace performance regression during rcu
** Tags removed: verification-needed-trusty
** Tags added: verification-done
** Tags removed: verification-done
** Tags added: verification-done-trusty
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This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'.
If verification is not done by 5 working days from
** Branch linked: lp:ubuntu/precise-proposed/linux-lts-trusty
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Title:
Kernel network namespace performance regression during rcu
** Branch linked: lp:ubuntu/trusty-proposed/linux-keystone
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Title:
Kernel network namespace performance regression during rcu
This bug was fixed in the package linux - 3.16.0-11.16
---
linux (3.16.0-11.16) utopic; urgency=low
[ Mauricio Faria de Oliveira ]
* [Config] Switch kernel to vmlinuz (from vmlinux) on ppc64el
- LP: #1358920
[ Peter Zijlstra ]
* SAUCE: (no-up) mmu_notifier: add
** Description changed:
+ SRU Justification:
+
+ Impact: network namespace creation has performance regression since v3.5.
+ Fix: my analysis, lklm discussion, upstream patch
+ Testcase:
+
+ http://people.canonical.com/~inaddy/lp1328088/make_fake_routers.sh
+
** Changed in: linux (Ubuntu)
Status: New = Fix Committed
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Utopic)
Importance: Undecided
Status: Fix Committed
** Changed in: linux (Ubuntu Trusty)
Status:
Upstream suggestions/observations were accepted and code was changed:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=728dba3a39c66b3d8ac889ddbe38b5b1c264aec3
These changes were already tested and worked good for the performance
regression.
Suggesting SRU to our kernel
** Tags added: bisect-done
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Title:
Kernel network namespace performance regression during rcu development
on kernels above 3.8
Related upstream discussion:
https://lkml.org/lkml/2014/6/11/42
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Title:
Kernel network namespace performance regression during rcu
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Title:
Kernel network namespace performance regression
** Description changed:
Please, follow this in: http://people.canonical.com/~inaddy/lp1328088/.
Same description on daily-basis updated text.
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-
- It was brought to my attention that fake router creation scalability
- was affected during kernel development.
+ It was brought to my
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