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== Comment: #0 - Michael Ranweiler <mranw...@us.ibm.com> - 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
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-171272 severity-high
targetmilestone-inin---
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Ubuntu18.04: GPU total memory is reduced
https://bugs.launchpad.net/bugs/1792102
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