Hi,
I'd not want to diverge from the upstream default in this case.
It is not the effort to carry the patch to enable it in the pseries-cosmic
type, instead the reasons are:
- Being upstream off means it is less tested and therefore less stable
ppc64el is already not the most run arch, and a default change unless strictly
needed would make us a too much of a special snowflake which can be nice
but all too often also comes with
- TBH it still seems too buggy
- Leonardo/Breno will remember all the "switch it off/on" changes we had
about 4
months ago being scared it would be default on and broken in 2.11 on P9
- bug 1792501 of tonight shows there are more issues to come (nice timing to
show my point)
- whenever needed it can be enabled by a user/admin via configuration of the
guests
I'd recommend to keep it off by default to avoid showing users into a
default mode that (unfortunately) likely might show issues identified
later on.
If you want to switch it on badly you can:
a) request us to do so on your risk. But we can't flip the default after
feature freeze in a week. And if issues are found I do not want to
implement/maintain migration workarounds for something that was chosen
willingly while expecting issues. So it might end up with really bad cases at
the customers which won't be good (keeping default off and having those that
want to use it enabling it is much less critical as you know).
b) make it stable enough and switch it on upstream and we will pick it up in
the qemu version that will do so which at least means Upstream, Ubuntu and all
others would be affected the same.
** Changed in: qemu (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1792438
Title:
[Ubuntu 18.10] Need to enable TM in pseries-cosmic
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