** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => High
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu)
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) =>
Joseph Salisbury (jsalisbury)
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https://bugs.launchpad.net/bugs/1792102
Title:
Ubuntu18.04: GPU total memory is reduced
Status in The Ubuntu-power-systems project:
Triaged
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
== Comment: #0 - Michael Ranweiler <[email protected]> - 2018-09-10
19:26:14 ==
Due to a recent change for powernv, now the total GPU memory is no
longer available. This impacts performance for any
application/benchmark has a large GPU memory utilization.
Previous amount of memory : 16128MiB
Current amount of available memory : 15360MiB
From Anton, describing the recent change.:
powerpc/powernv: Increase memory block size to 1GB on radix
Memory hot unplug on PowerNV radix hosts is broken. Our memory block
size is 256MB but since we map the linear region with very large
pages, each pte we tear down maps 1GB.
A hot unplug of one 256MB memory block results in 768MB of memory
getting unintentionally unmapped. At this point we are likely to oops.
Fix this by increasing our memory block size to 1GB on PowerNV radix
hosts.
Fixes: 4b5d62ca17a1 ("powerpc/mm: add radix__remove_section_mapping()")
This is fixed with:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7acf50e4efa6
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