On 16/05/18 17:47, Peter Zijlstra wrote: > On Wed, May 16, 2018 at 05:19:25PM +0200, Juri Lelli wrote: > > > Anyway, FWIW I started testing this on a E5-2609 v3 and I'm not seeing > > hackbench regressions so far (running with schedutil governor). > > https://en.wikipedia.org/wiki/Haswell_(microarchitecture)#Server_processors > > Lists the E5 2609 v3 as not having turbo at all, which is basically a > best case scenario for this patch. > > As I wrote earlier today; when turbo exists, like say the 2699, then > when we're busy we'll run at U=2.3/3.6 ~ .64, which might confuse > things.
Indeed. I was mostly trying to see if adding this to the tick might introduce noticeable overhead.
