From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Mon, 16 May 2005 20:58:53 +0000 Subject: Re: IA64 implementation of timesource for new time of day subsystem Message-Id: <17033.2445.545597.210557@napali.hpl.hp.com> List-Id: References: <1116029796.26454.2.camel@cog.beaverton.ibm.com> <1116029872.26454.4.camel@cog.beaverton.ibm.com> <1116029971.26454.7.camel@cog.beaverton.ibm.com> <1116030058.26454.10.camel@cog.beaverton.ibm.com> <1116030139.26454.13.camel@cog.beaverton.ibm.com> <1116264858.26990.39.camel@cog.beaverton.ibm.com> <1116269136.26990.67.camel@cog.beaverton.ibm.com> <17032.62615.750699.18847@napali.hpl.hp.com> <1116273055.13867.5.camel@cog.beaverton.ibm.com> <1116276824.13867.15.camel@cog.beaverton.ibm.com> In-Reply-To: <1116276824.13867.15.camel@cog.beaverton.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: john stultz Cc: Christoph Lameter , David Mosberger , lkml , Tim Schmielau , George Anzinger , albert@users.sourceforge.net, Ulrich Windl , Dominik Brodowski , Andi Kleen , paulus@samba.org, schwidefsky@de.ibm.com, keith maanthey , Chris McDermott , Max Asbock , mahuja@us.ibm.com, Nishanth Aravamudan , Darren Hart , "Darrick J. Wong" , Anton Blanchard , donf@us.ibm.com, mpm@selenic.com, benh@kernel.crashing.org, linux-ia64@vger.kernel.org >>>>> On Mon, 16 May 2005 13:53:44 -0700, john stultz said: John> You've only pointed out two timesources that could want this John> (ITC and TSC), so I think its reasonable to do your jitter John> handling in the timesource driver. If there are other arches John> that have non hardware synced per-cpu counters, then it would John> be something to consider. I think Christopher's point is that _all_ time-sources which require software syncing will need this since it is not possible to sync perfectly, even if there is no drift. --david