Wait, someone else needs to mark it as confirmed.
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https://bugs.launchpad.net/bugs/1368439
Title:
Random high latency with KSM enabled and multiple CPU sockets
To ma
I've looked through all the logs that are relevant and can't find any
specific output that's relevant - marking as confirmed.
If you've got any logs in specific you need me to pull out I can do so.
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I should add that to fix this while running you need to do, as root:
echo 2 > /sys/kernel/mm/ksm/run
This makes the pages duplicate, might take a second or two and disables
KSM.
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Public bug reported:
If running a box with multiple CPU sockets and Ubuntu 14.04 Server
64-bit qemu-kvm with KSM enabled as by default, random high latency
occurs on network connections for VMs, as high as 4000ms - 5000ms. The
host also reports high IO wait times.
Disabling KSM fixed this for me.
