documentation-packages team mailing list archive

[Gunnar Hjalmarsson <1666286@xxxxxxxxxxxxxxxxxx>]

Hi!

You filed this bug report against the ubuntu-docs package, which is a
basic user documentation for the Ubuntu desktop. To be honest, what you
talk about is far above my head, but I doubt that the topic is suitable
for ubuntu-docs.

Can you please provide some further information, so we can figure out
which kind of docs (if any) might be affected.

** Changed in: ubuntu-docs (Ubuntu)
       Status: New => Incomplete

** Changed in: ubuntu-docs (Ubuntu)
     Assignee: Taco Screen team (taco-screen-team) => (unassigned)

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https://bugs.launchpad.net/bugs/1666286

Title:
  Memory hot plug: increase the number of slots from '32' to '256'
  (Documentation)

Status in ubuntu-docs package in Ubuntu:
  Incomplete

Bug description:
  IBM would like to have the following documented wherever appropriate:

  ---Problem Description---
  In Ubuntu 17.04, when trying to increase the number of memory slots from 32 to 256, only 63 slots were available even though 256 slots was specified in the guest xml.

  Machine Type = POWER8

  Even though 256 slots are supported in QEMU 2.8, distributed with
  Ubuntu 17.04, there is an implicit limit coming from the vhost
  backend, limiting the  number of max memory slots that are supported.

  The work around is to increase the vhost mem slots by reloading the
  vhost module in the guest:

  [root@localhost ~]# modprobe -r vhost
  [root@localhost ~]# modprobe vhost max_mem_regions=512
  [root@localhost ~]# cat /sys/module/vhost/parameters/max_mem_regions
  512

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