linux-kernel - Re: TSC && HPET calibration

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Message-Id: <20080115135318.M68697@visp.net.lb>
Date:	Tue, 15 Jan 2008 15:54:12 +0200
From:	"Denys Fedoryshchenko" <denys@...p.net.lb>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: TSC && HPET calibration

Latest, 2.6.24-rc7, and 2.6.23 is the same.

If more information required, tell me. It is btw not latest (not based on 
Core2) Xeon.


On Tue, 15 Jan 2008 02:17:20 -0800, Andrew Morton wrote
> On Thu, 10 Jan 2008 14:36:12 +0200 "Denys Fedoryshchenko" 
> <denys@...p.net.lb> wrote:
> 
> > Hi
> > 
> > I have same issue, but it's never passed synchronization.
> > 
> > Jan 10 12:59:44 visp-1 Time: tsc clocksource has been installed.
> > Jan 10 13:41:51 visp-1 ACPI: HPET 000F29CD, 0038 (r1 DELL   
PE_SC3          1 
> > DELL        1)
> > Jan 10 13:41:51 visp-1 ACPI: HPET id: 0x8086a201 base: 0xfed00000
> > Jan 10 13:41:51 visp-1 hpet clockevent registered
> > Jan 10 13:41:51 visp-1 checking TSC synchronization [CPU#0 -> CPU#1]: 
passed.
> > Jan 10 13:41:51 visp-1 checking TSC synchronization [CPU#0 -> CPU#2]:
> > Jan 10 13:41:51 visp-1 Measured 1020 cycles TSC warp between CPUs, 
turning 
> > off TSC clock.
> > Jan 10 13:41:51 visp-1 Marking TSC unstable due to: check_tsc_sync_source 
> > failed.
> > Jan 10 13:41:51 visp-1 hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
> > Jan 10 13:41:51 visp-1 hpet0: 3 64-bit timers, 14318180 Hz
> > Jan 10 13:41:51 visp-1 Time: hpet clocksource has been installed.
> > 
> > grep Measures
> > Sep 19 14:31:28 visp-1 Measured 1044 cycles TSC warp between CPUs, 
turning 
> > off TSC clock.
> > Sep 19 18:22:46 visp-1 Measured 996 cycles TSC warp between CPUs, turning 
off 
> > TSC clock.
> > Sep 19 18:35:44 visp-1 Measured 1080 cycles TSC warp between CPUs, 
turning 
> > off TSC clock.
> 
> Which kernel version?


--
Denys Fedoryshchenko
Technical Manager
Virtual ISP S.A.L.

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