Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

David Miller
2008-11-17T20:18:44Z

From: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Date: Mon, 17 Nov 2008 11:57:55 -0800 (PST)

> On Mon, 17 Nov 2008, David Miller wrote:
> > And as a result I found that wake_up() is now 4 times slower than it
> > was in 2.6.22, I even analyzed this for every single kernel release
> > till now.
>
> ..and that's the one where you then pointed to hrtimers, and now you claim
> that was fixed?

That was a huge increase going from 2.6.26 to 2.6.27, and has
been fixed.

The rest of the gradual release-to-release cost increase, however,
remains.

> At least I haven't seen any new analysis since then.

I will find time ot make it after I get back from Portland.