** Tags added: cscc
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Title:
kvm brings Oneiric host to a grinding halt
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** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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Title:
kvm brings Oneiric host to a grinding halt
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Juerg Haefliger, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
Juerg Haefliger, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
** Tags added: bios-outdated-f.20 needs-upstream-testing
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Title:
kvm brings Oneiric host to a grinding halt
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** Tags added: bios-outdated-f.20 needs-upstream-testing
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Title:
kvm brings Oneiric host to a grinding halt
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Good catch. I missed the 'Unaligned AIO/DIO' message. However, why would
this cause other processes to start hogging the CPU? Also, I created a
new Windows image and I still get the 'Unaligned AIO/DIO' message but
the system does not get into the same state where multiple processes
will comsume
** Changed in: qemu-kvm (Ubuntu)
Status: Incomplete = Confirmed
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Title:
kvm brings Oneiric host to a grinding halt
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I'm really not certain, but I would guess other processes would start
hogging the cpu because their writes are being serialized with bulk
writes by the guest?
It seems some filesystems (XFS, ext3?) should be immune to this, so if
you have a spare partition then you could try using a different
Once in this state, the system doesn't recover by itself. When I kill
kvm, things seem to go back to normal but if I start it up again the CPU
usage of the same couple of processes goes up again, almost
immeditately. Only a reboot fixes it so that it stays stable for a
longer amount of time.
Only
apport information
** Tags added: apport-collected oneiric running-unity
** Description changed:
I'm running a Windows7 guest in KVM via libvirt/virt-manager on a
Oneiric desktop 64-bit. Every once in a while (2-3 times a week,
sometimes daily) the CPU usage goes berserk and the host
Thanks for the info.
dmesg shows
[22149.060532] EXT4-fs (md0): Unaligned AIO/DIO on inode 13632016 by
kvm; performance will be poor.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Marked this as affecting linux in the hopes that kernel folks might know
what
[22149.060532] EXT4-fs (md0): Unaligned AIO/DIO on inode 13632016 by
kvm; performance will be poor.
means
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Note,
I believe as a workaround (assuming the error message explains your
problem) you should be able to run xp from a virtual drive that is not
on a raid disk. Assuming you have such.
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** Changed in: linux (Ubuntu)
Status: New = Confirmed
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kvm brings Oneiric host to a grinding halt
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Title:
kvm brings Oneiric host to a grinding
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kvm brings
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Thanks for reporting this bug.
After this happens, do you have to reset the system, or does it get
better after awhile?
Is it kvm itself, or libvirt, which is taking the cpu time?
Do you usually have only one vm up when this is happening?
Is there anything interesting in syslog?
** Changed
Please also run 'apport-collect 973536'.
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Title:
kvm brings Oneiric host to a grinding halt
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