Random high latency with KSM enabled and multiple CPU sockets
Bug #1368439 reported by
Lawrence Dudley
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Undecided
|
Unassigned | ||
qemu-kvm (Ubuntu) |
Expired
|
Low
|
Unassigned |
Bug Description
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-
no longer affects: | linux |
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affects: linux