From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Luck, Tony" Date: Tue, 28 May 2002 22:48:49 +0000 Subject: RE: [Linux-ia64] NTP broken? Message-Id: 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 I compared a HZ0 kernel with a HZ24 kernel on a BigSur ... it made no obvious difference, both kernels lost time at about 38.5 milliseconds/minute relative to a machine running NTP. -Tony -----Original Message----- From: David Mosberger [mailto:davidm@napali.hpl.hp.com] Sent: Friday, May 24, 2002 7:33 PM To: Peter Chubb Cc: linux-ia64@linuxia64.org Subject: Re: [Linux-ia64] NTP broken? >>>>> On Wed, 22 May 2002 13:08:08 +1000, Peter Chubb said: Peter> NTP on Linux 2.4.17/IA64 appears broken. ntpd never seems to Peter> be able to pull the PLL into sync, even after using ntpdate Peter> to set the clock to the correct server time. Peter> What are other peoples' experiences with NTP on IA64? I'm not aware of any problems with NTP keeping in sync with realtime. However, I do think the drift on the kernel's time-of-day (without NTP synchronization) may be bigger than it could be. This could be due to rounding errors, due to the CPU clock not being accurate enough, or something else entirely. Some time ago, I did look over the code and didn't find any obvious rounding errors, but that doesn't mean they don't exist. Actually, one experiment that might be worth doing is to set HZ to 100. This will make maintaining the time-of-day slightly easier and since it also happens to be the freq used by x86, makes it almost certain that there are no other subtle issues. --david _______________________________________________ Linux-IA64 mailing list Linux-IA64@linuxia64.org http://lists.linuxia64.org/lists/listinfo/linux-ia64