From: Andrew Morton <akpm@linux-foundation.org>
To: Gabriel C <nix.or.die@googlemail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Gabriel C <crazy@frugalware.org>,
Thomas Gleixner <tglx@linutronix.de>,
john stultz <johnstul@us.ibm.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box
Date: Mon, 25 Feb 2008 12:14:40 -0800 [thread overview]
Message-ID: <20080225121440.32810c91.akpm@linux-foundation.org> (raw)
In-Reply-To: <47C0BAD9.7030908@googlemail.com>
On Sun, 24 Feb 2008 01:31:21 +0100 Gabriel C <nix.or.die@googlemail.com> wrote:
> Hi,
>
> I noticed tsc is always marked unstable on my box with 2.6.25* , 2.6.24 is fine.
>
> ...
>
> [ 0.825760] ACPI: PCI Interrupt 0000:03:0e.0[A] -> GSI 22 (level, low) -> IRQ 22
> [ 0.805755] Switched to high resolution mode on CPU 1
> [ 0.794244] Switched to high resolution mode on CPU 2
> [ 0.766968] Switched to high resolution mode on CPU 3
> [ 1.083944] Switched to high resolution mode on CPU 0
> [ 15.388792] Clocksource tsc unstable (delta = 9373391604 ns)
> [ 15.714648] Time: acpi_pm clocksource has been installed.
>
> ...
>
> Booting nohz=off fixes that.
>
> Another strange thing is when I try to boot that kernel with clocksource=acpi_pm it just hangs.
>
> config is attached.
>
> Please let me know if you need more infos / want me to try patches or anything else.
>
>
I suppose we should consider this a regression. If only because acpi_pm is
slower. But mainly because (afaik) this change was not intentional.
next prev parent reply other threads:[~2008-02-25 20:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-24 0:31 Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO_HZ=y on my box Gabriel C
2008-02-25 20:14 ` Andrew Morton [this message]
[not found] <fa.FpheN5sIQ5rxoLHYuhxxf6uauVs@ifi.uio.no>
2008-02-25 4:33 ` Robert Hancock
2008-02-25 7:40 ` Thomas Gleixner
2008-02-25 16:56 ` Gabriel C
2008-02-25 19:39 ` Thomas Gleixner
2008-02-25 20:48 ` Gabriel C
2008-03-12 7:11 ` Thomas Gleixner
2008-03-13 3:30 ` Gabriel C
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