From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: [PATCH 1/3] cpufreq: pmac64: speed up frequency switch Date: Mon, 12 Aug 2013 11:07:48 +1000 Message-ID: <1376269668.32100.148.camel@pasglop> References: <1374611079-28091-1-git-send-email-aaro.koskinen@iki.fi> <9298823.WUCyZreP9q@vostro.rjw.lan> <1374614043.3916.84.camel@pasglop> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from gate.crashing.org ([63.228.1.57]:49388 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755206Ab3HLBIP (ORCPT ); Sun, 11 Aug 2013 21:08:15 -0400 In-Reply-To: <1374614043.3916.84.camel@pasglop> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: "Rafael J. Wysocki" Cc: Nick Piggin , Viresh Kumar , linux-pm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Aaro Koskinen On Wed, 2013-07-24 at 07:14 +1000, Benjamin Herrenschmidt wrote: > On Tue, 2013-07-23 at 23:20 +0200, Rafael J. Wysocki wrote: > > All looks good in the patchset from 10000 feet (or more), but I need > > Ben to speak here. > > I want to give it a quick spin on the HW here, I'll ack then. But yes, > it looks good. Seems to work here on the quad G5. However, If I use on-demand, there's a huge latency of switch as far as I can tell (about 10s) after I start/stop a bunch of CPU eaters... I quite like how the userspace "powernowd" which I used to use switches more aggressively. Is that expected ? Cheers, Ben.