From: Chris Friesen <cfriesen@nortel.com>
To: george@mvista.com
Cc: bhavesh@avaya.com, linux-kernel@vger.kernel.org
Subject: Re: 2.6.11 timeval_to_jiffies() wrong for ms resolution timers
Date: Wed, 25 May 2005 11:37:49 -0600 [thread overview]
Message-ID: <4294B7ED.2030307@nortel.com> (raw)
In-Reply-To: <4294B42D.2020008@mvista.com>
George Anzinger wrote:
> Bhavesh P. Davda wrote:
>> setitimer for 20ms was firing at 21ms
> If we do NOT account for this PIT issue, the result is a time drift that
> is outside of what ntp can handle...
Still, it is non-intuitive that a multi-GHz machine can't wake you up
more accurately than 1ms.
What about telling it to wake up a jiffy earlier, then checking whether
the scheduling lag was enough to cause it to have waited the full
specified time. If not, put it to sleep for another jiffy.
Chris
next prev parent reply other threads:[~2005-05-25 17:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-24 22:59 2.6.11 timeval_to_jiffies() wrong for ms resolution timers Bhavesh P. Davda
2005-05-25 17:21 ` George Anzinger
2005-05-25 17:37 ` Chris Friesen [this message]
2005-05-25 17:54 ` George Anzinger
2005-05-25 18:07 ` Chris Friesen
-- strict thread matches above, loose matches on Subject: below --
2005-05-25 19:06 Davda, Bhavesh P (Bhavesh)
2005-05-25 20:02 ` George Anzinger
2005-05-25 21:41 ` Thomas Gleixner
2005-05-26 17:04 ` Olivier Croquette
2005-05-26 18:10 ` Richard B. Johnson
2005-05-26 18:19 ` Lee Revell
2005-05-26 19:24 ` George Anzinger
2005-05-26 19:32 ` Lee Revell
2005-05-25 19:16 Davda, Bhavesh P (Bhavesh)
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