Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756870Ab0HIUTe (ORCPT ); Mon, 9 Aug 2010 16:19:34 -0400 Received: from mailout-de.gmx.net ([213.165.64.22]:51620 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1756735Ab0HIUTc (ORCPT ); Mon, 9 Aug 2010 16:19:32 -0400 X-Authenticated: #23875046 X-Provags-ID: V01U2FsdGVkX19G6C45WT5GsPTegwtHTNjIEDZ9dqbTNmscP6Dqm5 Mvp7AVlx1mHRd8 Subject: Re: [BISECTED/2.6.35+] Regression: Machine runs really slowly after commit f12a15be From: Alexey Fisher To: john stultz Cc: Priit Laes , linux-kernel , tglx@linutronix.de, Chris Wilson In-Reply-To: <1281383518.2444.7.camel@localhost.localdomain> References: <1281186941.23274.5.camel@chi> <1281380498.2444.2.camel@localhost.localdomain> <1281382707.22355.0.camel@mini> <1281383518.2444.7.camel@localhost.localdomain> Content-Type: text/plain; charset="UTF-8" Date: Mon, 09 Aug 2010 22:19:29 +0200 Message-ID: <1281385169.5065.0.camel@zwerg> Mime-Version: 1.0 X-Mailer: Evolution 2.30.2 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1818 Lines: 52 On Mo, 2010-08-09 at 12:51 -0700, john stultz wrote: > On Mon, 2010-08-09 at 21:38 +0200, Alexey Fisher wrote: > > cat /sys/devices/system/clocksource/clocksource0/current_clocksource > > hpet > > > > cat /sys/devices/system/clocksource/clocksource0/available_clocksource > > hpet acpi_pm > > > On Mon, 2010-08-09 at 22:43 +0300, Priit Laes wrote: > > cat /sys/devices/system/clocksource/clocksource0/current_clocksource > > hpet > > cat /sys/devices/system/clocksource/clocksource0/available_clocksource > > hpet acpi_pm > > > Ok. Good. Chris Wilson has created the following patch which should > hopefully resolve this issue. It would be great if you could try booting > with it to verify that there are no other problems lurking here. > > Thanks again for the great bug reporting! > > thanks > -john > > > From: Chris Wilson > Subject: [PATCH] x86/hpet: Use the FSEC_PER_SEC constant for femto-second > periods > > The current computation, introduced with f12a15be63, of FSEC_PER_SEC using > the multiplication of (FSEC_PER_NSEC * NSEC_PER_SEC) is performed only > with 32bit integers on small machines, resulting in an overflow and a > *very* short intervals being programmed. An interrupt storm follows. > > Note that we also have to specify FSEC_PER_SEC as being long long to > overcome the same limitations. > > Signed-off-by: Chris Wilson > Signed-off-by: John Stultz > Cc: Thomas Gleixner > --- This patch work for me. At least it boot. Tank you. -- 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/