From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Wed, 09 Feb 2005 19:53:30 +0000 Subject: Re: What contributes to IA64 ITC/TOD drift? Message-Id: <16906.27194.372672.998370@napali.hpl.hp.com> List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Tue, 8 Feb 2005 18:27:01 -0800, "John Lee" said: John> Maybe too broad a question but, John> 1. What in IA64 platform contributes to ITC drift? Are you asking when the IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT bit should be set? If so, then the answer is that it should be set whenever the ITC clocks of the processors in a machine are not driven off the same oscillator. John> 2. What in IA64 platform contributes to TOD fluctuation? John> (excluding the quality of oscillator) NTP comes to mind. Any other error I can think of probably would lead to a systematic error, not to fluctuations. --david