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SubjectRe: [PATCH 0/3] PTI for x86-32 Fixes and Updates
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> On Jul 24, 2018, at 6:39 AM, Pavel Machek <pavel@ucw.cz> wrote:
>
>> On Mon 2018-07-23 12:00:08, Linus Torvalds wrote:
>>> On Mon, Jul 23, 2018 at 7:09 AM Pavel Machek <pavel@ucw.cz> wrote:
>>>
>>> Meanwhile... it looks like gcc is not slowed down significantly, but
>>> other stuff sees 30% .. 40% slowdowns... which is rather
>>> significant.
>>
>> That is more or less expected.
>
> Ok, so I was wrong. bzip2 showed 30% slowdown, but running test in a
> loop, I get (on v4.18) that, too.
>
>

...

The obvious cause would be thermal issues, which are increasingly common in laptops. You could get cycle counts from perf stat, perhaps.

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