On Fri, Oct 27, 2023 at 01:54:28AM +0200, Justin Yates Fletcher wrote: > On Wed, 2023-10-25 at 20:25 -0400, Raul Miller wrote: > > On Wed, Oct 25, 2023 at 8:16 PM Justin Yates Fletcher > > <jyfletc...@gmail.com> wrote: > > > On Wed, 2023-10-25 at 21:12 +0200, Mike Fischer wrote: > > > > > > > > > Am 25.10.2023 um 17:57 schrieb Theo de Raadt > > > > > <dera...@openbsd.org>: > > > > > Mike Fischer <fischer+o...@lavielle.com> wrote: > > > > > > > Am 25.10.2023 um 17:29 schrieb Theo de Raadt > > > > > We changed a lot of kernel scheduling code *without giving a > > > > > damn > > > > > about the stability of this number* > > > > > > > > Fine, but you are not changing my running Kernel, are you? > > > > > > I don't understand your point with this. Are you making an > > > accusation? > > > If not, then why even write this? > > > > I think Mike Fischer's point was that the change did not correspond > > to > > a kernel upgrade. > > > > It is hyperbole or accusational... or somewhere on that spectrum. > Either way, it serves no valuable purpose, so why even write that? > > Also, there was a kernel change: 7.4. Pretty sure that was mentioned. > > > > (And I think Theo de Raadt's point was that there's not enough rigor > > on load average to diagnose this issue.) > > > > Theo's point, as I read it, was just that the load average is > calculated in the same way as before, even though there have been > changes in other parts of the system that could affect it.
Just to be clear. There was a change in how the load avarage is calculated. So it may cause differences in numbers. Do we care about that? No because it was done to be able to work on more important projects. > It has nothing to do with rigor. The OS could just always report 0.0. > If you start artifically changing a metric, for the sake of rigor, then > that metric is no longer valuable: > > https://en.wikipedia.org/wiki/Goodhart%27s_law > > Changing how a mertic is calculated to meet a target certainly reduces > the value of the metric, right? I do not agree. The load avarage has some value but most people do not understand how it is calculated and what a significant change is. Also systems change, so metrics change all the time. They still offer a good value. -- :wq Claudio
