From: Ingo Molnar <mingo@elte.hu>
To: Henri Hunnekens <henrihunnekens@gmail.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: TSC calibration sometimes not correct with RT patch.
Date: Wed, 25 Jul 2007 09:39:49 +0200 [thread overview]
Message-ID: <20070725073949.GB595@elte.hu> (raw)
In-Reply-To: <e9f486400707250025k163d34cdk97cf2722db739634@mail.gmail.com>
* Henri Hunnekens <henrihunnekens@gmail.com> wrote:
> I've seen that the calbration of the TSC timer was not always done
> correctly, which resulted in incorrect timers.
>
> I found out that local_irq_disable is used before the calibration is
> started. However with the RT patch applied this does not mean that the
> interrupts are disabled and therefore the calibration may fails when
> it's interrupted by an interrupt. Correct me if I'm wrong.
local_irq_disable() still disables interrupts, even in PREEMPT_RT. So
the problem should be elsewhere. Can you see similar problems on .22-rt
too? The hrt code saw a number of updates there.
Ingo
next prev parent reply other threads:[~2007-07-25 7:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-25 7:25 Henri Hunnekens
2007-07-25 7:39 ` Ingo Molnar [this message]
2007-07-25 7:56 ` Henri Hunnekens
2007-07-25 10:30 ` Joachim Deguara
2007-07-25 11:39 ` Henri Hunnekens
2007-07-25 11:41 ` Ingo Molnar
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