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From: Srivatsa Vaddagiri <vatsa@in.ibm.com>
To: Kyle Moffett <mrmacman_g4@mac.com>
Cc: Con Kolivas <kernel@kolivas.org>,
	ck@vds.kolivas.org, Tony Lindgren <tony@atomide.com>,
	tuukka.tikkanen@elektrobit.com, Andrew Morton <akpm@osdl.org>,
	johnstul@us.ibm.com,
	linux-kernel Kernel <linux-kernel@vger.kernel.org>,
	Andi Kleen <ak@muc.de>,
	george@mvista.com
Subject: Re: [ck] [PATCH] dynamic-tick patch modified for SMP
Date: Mon, 15 Aug 2005 21:17:26 +0530	[thread overview]
Message-ID: <20050815154726.GB4731@in.ibm.com> (raw)
In-Reply-To: <6189ECD1-1CE7-4E36-B9F4-FD4D9E5871FA@mac.com>

On Sun, Aug 14, 2005 at 12:15:38AM -0400, Kyle Moffett wrote:
> It may be a good idea to rebase this patch off the new generic time- 
> keeping
> subsystem that John Stultz is working on.

I _am_ using the new subsystem interface (->mark_offset) to catch up with lost
ticks. Only I don't think it is that good at catching up the lost ticks if we
skip ticks for few seconds in a stretch. For ex: I am observing drift (time
slows down) when skipping ticks for upto 5 seconds on a 699MHz P3 SMP hardware.
Both TSC and ACPI pm timer give this drift. I am investigating this and will
post an update as soon as I get more information.



-- 


Thanks and Regards,
Srivatsa Vaddagiri,
Linux Technology Center,
IBM Software Labs,
Bangalore, INDIA - 560017

  reply	other threads:[~2005-08-15 16:25 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-12 20:19 Srivatsa Vaddagiri
2005-08-13  1:35 ` [ck] " Con Kolivas
2005-08-13  6:51   ` Con Kolivas
2005-08-13 11:37     ` Srivatsa Vaddagiri
2005-08-13 14:53       ` Con Kolivas
2005-08-13 16:46         ` Srivatsa Vaddagiri
2005-08-14  0:18           ` Con Kolivas
2005-08-14  4:15             ` Kyle Moffett
2005-08-15 15:47               ` Srivatsa Vaddagiri [this message]
2005-08-15 16:39                 ` john stultz
2005-08-16  2:11                   ` Srivatsa Vaddagiri
2005-08-15 15:35             ` Srivatsa Vaddagiri
2005-08-15 16:30               ` Con Kolivas
2005-08-16 13:19                 ` Srivatsa Vaddagiri
2005-08-16 13:23                   ` Con Kolivas
2005-08-17  7:53                     ` Tony Lindgren

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