Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761504AbYCUV7Z (ORCPT ); Fri, 21 Mar 2008 17:59:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756938AbYCUV7R (ORCPT ); Fri, 21 Mar 2008 17:59:17 -0400 Received: from fonzie.hosting9000.com ([85.214.50.12]:60764 "EHLO fonzie.hosting9000.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756371AbYCUV7R (ORCPT ); Fri, 21 Mar 2008 17:59:17 -0400 Message-ID: <47E42FAB.6000906@frugalware.org> Date: Fri, 21 Mar 2008 22:59:07 +0100 From: Gabriel C User-Agent: Thunderbird 2.0.0.12 (X11/20080226) MIME-Version: 1.0 To: Thomas Gleixner CC: Gabriel C , "Rafael J. Wysocki" , LKML , Adrian Bunk , Andrew Morton , Linus Torvalds , Natalie Protasevich , andi-bz@firstfloor.org, Ingo Molnar Subject: Re: 2.6.25-rc5-git6: Reported regressions from 2.6.24 References: <200803170018.52663.rjw@sisk.pl> <47DDB969.1060200@googlemail.com> <47DEB65A.9080907@googlemail.com> <47DF3E8B.6040502@googlemail.com> <47E3D322.1090902@googlemail.com> <47E3E66F.9040006@frugalware.org> <47E3FA4F.9060509@frugalware.org> <47E40B1C.30407@frugalware.org> <47E420C5.1050407@frugalware.org> In-Reply-To: Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1864 Lines: 55 Thomas Gleixner wrote: > On Fri, 21 Mar 2008, Gabriel C wrote: >>>>> Does that make any sense ? >>>> Not really. Can you please revert the reverted revert again and run >>>> >>>> http://people.redhat.com/mingo/time-warp-test/time-warp-test.c >>>> >>>> on your machine with all CPUs and HT enabled ? >>> Sure , doing so now. >>> >> Here the result on 2.6.25-rc6-00243-g028011e ( it was running 30++ >> minutes the time I was away for food =) ) >> ... >> >> 4 CPUs, running 4 parallel test-tasks. >> checking for time-warps via: >> - read time stamp counter (RDTSC) instruction (cycle resolution) >> - gettimeofday (TOD) syscall (usec resolution) >> - clock_gettime(CLOCK_MONOTONIC) syscall (nsec resolution) >> >> | 1.46 us, TSC-warps:0 | 16.01 us, TOD-warps:0 | 16.10 us, CLOCK-warps:0 > > Amazing. I never found a multi socket box where the TSC's were in sync. > > So the rotating watchdog triggers for a yet to figure out reason. > > Oh, now that the pm timer seems to work again, can you try the following: > > apply the reverted patch again and let the box boot. At some point the > TSC is marked unstable and is replaced by acpi_pm clocksource. > > What result does timewarp.c show in that situation ? Here it is , same kernel + Andi's patch : ./time-warp-test 4 CPUs, running 4 parallel test-tasks. checking for time-warps via: - read time stamp counter (RDTSC) instruction (cycle resolution) - gettimeofday (TOD) syscall (usec resolution) - clock_gettime(CLOCK_MONOTONIC) syscall (nsec resolution) | 1.78 us, TSC-warps:0 | 19.27 us, TOD-warps:0 | 19.37 us, CLOCK-warps:0 > > Thanks, > tglx Gabriel -- 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/