From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Fri, 13 Feb 2004 07:09:11 +0000 Subject: Re: [RFC][PATCH] linux-2.6.3-rc2_ia64-cyclone_A0 Message-Id: <16428.30743.435747.878573@napali.hpl.hp.com> List-Id: References: <1076556140.795.119.camel@cog.beaverton.ibm.com> In-Reply-To: <1076556140.795.119.camel@cog.beaverton.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Thu, 12 Feb 2004 18:29:35 -0800, john stultz said: John> I'm not sure I see how gettimeofday will use ITC based John> interpolation if the ITCdrift is off. Sure, the ITC will John> register a timesource, but init_cyclone_clock runs after John> time_init and has a negative drift value, so on the x450/x455 John> the cyclone interpolator will be used. John> Am I missing something? Yes: it's the _lightweight_ gettimeofday() handler that will get you. See arch/ia64/kernel/fsys.S:fsys_gettimeofday(). To date no distribution ships with light-weight syscall supported enabled, but the support is in the current glibc, so it's only a matter of time before this would start to bite. --david