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Date: Sat, 9 Apr 2016 00:17:52 -0700 From: "Doug Smythies" <dsmythies@...us.net> To: "'Mike Galbraith'" <umgwanakikbuti@...il.com> Cc: "'Peter Zijlstra'" <peterz@...radead.org>, "'Rafael J. Wysocki'" <rafael.j.wysocki@...el.com>, "'LKML'" <linux-kernel@...r.kernel.org>, "'Linux PM list'" <linux-pm@...r.kernel.org>, "'Rik van Riel'" <riel@...hat.com>, "'Rafael J. Wysocki'" <rjw@...ysocki.net> Subject: RE: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 On 2016.04.08 15:19 Doug Smythies wrote: > On 2016.04.08 14:00 Rafael J. Wysocki wrote: >> On Friday, April 08, 2016 08:50:54 AM Mike Galbraith wrote: >>> On Fri, 2016-04-08 at 08:45 +0200, Peter Zijlstra wrote: >>> >>>> Cute, I thought you used governor=performance for your runs? >>> >>> I do, and those numbers are with it thus set. >> Well, this is a trade-off. >> >> 4.5 introduced a power regression here so this one goes back to the previous >> state of things. > Mike: > > Could you send me, or point me to, the program "pipe-test"? > So far, I have only found one, but it is both old and not > the same program you are running (based on print statements). > > I realize I might not be to recreate your problem scenario anyhow, > I just want to try. I still didn't find the exact same program, but I think I found some earlier version of the correct test. I get (long term average): Kernel 4.4.0-17: Powersave 3.93 usecs/loop ; Performance 3.93 usecs/loop 0.89 Kernel 4.5-rc7: Powersave 3.47 usecs/loop ; Performance 3.51 usecs/loop 1.00 Kernel 4.6-rc1: Powersave 3.84 usecs/loop ; Performance 3.88 usecs/loop 0.90 So, similar results (so far, I didn't try reverted yet). ... Doug
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