Bug seems to have been addressed by a kernel update per #30. Closing
** Changed in: linux (Ubuntu)
Status: Confirmed => Won't Fix
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Title:
** Changed in: linux (Ubuntu)
Assignee: Chris J Arges (arges) => (unassigned)
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Title:
KSM causing performance and instability issues
To man
Hi,
I installed a new machine from the 14.04.2 media which gave me the HWE
stack with kernel 3.16.0-33-generic and it's running with no problems.
The machine is now loaded up to 125GB worth of VMs and with the
following memory stats:
# free -m
total used free shared
Hi Chris,
Thanks for the help so far. I'm deploying a new machine right now and
I'll be trying to replicate it on -48.
The way I detected it was that i'd see messaging in "dmesg" on guest
similar to this:
hrtimer: interrupt took 4352551231 ns
In addition, when pinging the machine, you'd have
I've attempted to reproduce bug 1346917 again on a NUMA machine and was
unable to do so with the latest 3.13 kernel. Perhaps I could have more
details on how your reproducing this issue to assist with debugging?
Thanks
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** Description changed:
This seems to be a bug that has regressed, I have encountered the same
issue as 2 other reports:
+ LP: #1346917
LP: #1349897
Running kernel: 3.13.0-46-generic
This is replicated over many compute nodes (KVM) running OpenStack.
The workaround is to disab
In addition could you explain more in depth about the performance an
instability issues you've observed? How do you detect them or test for
them? Thanks
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Can you also test with /sys/kernel/mm/ksm/merge_across_nodes set to 0
(and KSM enabled normally) and confirm this is a KSM+NUMA issue?
Another way to potentially cause this issue to occur faster would be to set:
/sys/kernel/mm/ksm/sleep_millisecs to a value lower than 200
or
/sys/kernel/mm/ksm/pag
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Tags added: kernel-da-key
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Title:
KSM causing performance and instability issu
I'll be setting up a new server in the next few days, I'll attempt to
use -48 and see if that issue is present or not.
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Title:
KSM causing perfor
apport information
** Attachment removed: "BootDmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1435363/+attachment/4353426/+files/BootDmesg.txt
** Attachment removed: "CurrentDmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1435363/+attachment/4353427/+files
apport information
** Tags added: apport-collected trusty
** Description changed:
This seems to be a bug that has regressed, I have encountered the same
issue as 2 other reports:
LP: #1349897
Running kernel: 3.13.0-46-generic
This is replicated over many compute nodes (KVM) ru
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