IIRC, there is major performance degradation (anti-Spectre) in 4.20 that will be turned off by default 4.21.

Will it be turned off by default in the 4.20 rebase?

Joseph D. Wagner

On 2019-01-08 14:31, Justin Forbes wrote:

The 4.20 kernel was released just before the end of the year, but the
first stable update should be dropping in the next day or two.  We
have a 4.20 test day scheduled for Tuesday, January 15th.  Depending
on the results of that test day, Fedora 29 will be rebased very
shortly afterwards, followed by F28 approximately a week later.  Of
course the results of the test day could end up changing this, but it
is the current plan.

Thanks,
Justin
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