That may be, but Brendan Gregg is not a junior flipping switches, and a resource like this can help others do smart tuning.
No, Brendan Gregg is certainly no junior. The issue is that people take his advice as law and do not read further.
I, myself, remember flipping random switches because a (book) resource said that it would unlock performance.
I’m suggesting that taking the time to understand performance properly is ideal and I am attempting to urge people to properly invest the time.
Then I am lamenting the fact that we do not actually have time over because there’s so much smushing of responsibilities.
That's because Brendan Gregg doesn't flip switches, he shouts at hard drives[1]. ;-)