This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1808412
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1808412
Title:
4.15.0 memory allocation issue
Status in linux package in Ubuntu:
Incomplete
Bug description:
My server is :
PowerEdge T630
2x Intel(R) Xeon(R) CPU E5-2623 v4 @ 2.60GHz
128G of ram
4x VGA compatible controller [0300]: NVIDIA Corporation GP102 [TITAN X]
[10de:1b00] (rev a1)
Starting 116G ram 16vcpus + 4 pci passthrough allocating memory stops
after about half of the memory.
When upgrading from kernel 4.13.0 to 4.15.0 starting a vm takes a long
time.
I tested kernel :
linux-image-4.13.0-37 not affected
linux-image-4.13.0-45 not affected
linux-image-4.15.0-34 affected
linux-image-4.15.0-42 affected
After disabling transparent_hugepage on 4.15 everything seems to work
correctly.
cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.15.0-42-generic root=UUID=<some uuid> ro
intel_iommu=on transparent_hugepage=never splash quiet vt.handoff=7
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