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.
I run the same setup on boxes with only 1 CPU socket and it's not an
issue.
qemu-kvm version: Installed: 2.0.0+dfsg-2ubuntu1.3
** Affects: qemu-kvm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1368439
Title:
Random high latency with KSM enabled and multiple CPU sockets
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