Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757505AbYHNLkc (ORCPT ); Thu, 14 Aug 2008 07:40:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754175AbYHNLkY (ORCPT ); Thu, 14 Aug 2008 07:40:24 -0400 Received: from gv-out-0910.google.com ([216.239.58.184]:26710 "EHLO gv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753889AbYHNLkX (ORCPT ); Thu, 14 Aug 2008 07:40:23 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=aN2ycBGuSfsM36zhqmxd1tXZCBdz2UdTWqbzfuH7T/CethVZOxtFFjqPiHGXpTvs6q XrMCy5rZ+Qc3AmUKklOYcTdsOEn2azRBodgMmyGz/Zr734KaWNBWv4YIzn+LdIQgxDpV RlRBAJhYu5Gc+uATGR7/hRqBYy6a0ay9ITFZ4= Subject: RE: Possible CPU_IDLE bug [WAS: Re: Timer unstability on when using C2 and deeper sleep states (Dell Latitude XT)] From: Milan Plzik To: Thomas Gleixner Cc: "Pallipadi, Venkatesh" , Venkatesh , "linux-kernel@vger.kernel.org" In-Reply-To: References: <1218566008.13866.41.camel@localhost> <1218625125.4304.7.camel@localhost> <1218636980.5250.12.camel@localhost> <7E82351C108FA840AB1866AC776AEC460945BB44@orsmsx505.amr.corp.intel.com> <1218658873.4336.15.camel@localhost> <7E82351C108FA840AB1866AC776AEC460945BFF2@orsmsx505.amr.corp.intel.com> <1218701151.4285.9.camel@localhost> Content-Type: text/plain; charset=utf-8 Date: Thu, 14 Aug 2008 13:40:14 +0200 Message-Id: <1218714014.7111.7.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1573 Lines: 36 On Št, 2008-08-14 at 11:00 +0200, Thomas Gleixner wrote: > On Thu, 14 Aug 2008, Milan Plzik wrote: > > I tried it just now, is performs a bit better than 2.6.26 (e.g. I > > don't get that "press any key unless nothing happens" states), even > > reports a bit more reasonable values of wakeups, but the system > > sometimes becomes rather slow (e.g. when playing video). I was not able > > to compile fglrx driver, so I had to change it to radeon one. And also, > > the number of wakeups reported is not very convincing, though, it > > changes from 300 to 600 (which is ~ two times the sum of wakeups) > > without any reason, and sometimes goes even higher. > > > > I tried to use nolapic_timer option, but it didn't help. > > Can you please try "hpet=disable" on the kernel command line ? Looks like this has helped; after cold reboot hpet=disable seems to help the system to run properly (on 2.6.26 kernel). I wonder what could cause these problems. In the meanwhile I learned that this machine doesn't do proper cleanup during reboot -- it seems that state before reboot affects the state after reboot, so I should probably do some re-testing with cold reboot after each attempt. I guess I tried hpet=disable some time ago and after quick reboot it did not work properly. > > Thanks, > tglx Thank you, Milan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/