El Fri, 02-07-2010 a las 20:15 -0700, Hal Murray escribiĆ³: > Is that one of the old XOs that had troubles with the tiny battery feeding > the TOY/RTC clock when the main battery and wall power are both disconnected? > I forget the details, but I think there was a problem with the battery > holder.
Likely so, but the software should be able to compensate for it. After discussing it on IRC, it seems that olpc-update-query should automatically update the clock from the OATS server. > NetworkManager used to call ntpdate when it setup a connection. Was that an > OLPC addition? We figured out that the ntp package has never been present on the XO images. > I think this area gets tangled up with security and lease checking. Do we > want/need two separate modes, one for the secure case and another for > developers without a school server? Maybe. We discussed the security implications of using unauthenticated ntp on XOs with anti-theft enabled yesterday on IRC. The concern is that a clever thief could setup a LAN with DHCP, DNS and NTP to set a date in te past and thus subvert the leases expiration scheme. However, with root access on the laptop, one does not need to bother so much: they could simply change the time from the console or, better, in /etc/rc.local. There's no way to practical way to implement effective anti-theft without taking away root from the user. And once we take away root access, we've also taken away olpc's principle #1: child ownership. > What are the school servers doing to keep their clocks reasonable? They're using ntp, with the Fedora pool of ntp servers. > > Why aren't we using ntp? > > ntp is probably overkill for XOs. Besides, who would want to give up that > much ram? On top of that, ntpd doesn't get along with power saving mode. Wow, 2MB of RSS! I had no idea ntp was such a hog. > Aside from quirks like this one, is time on the XO normally good enough? I would have to check... -- // Bernie Innocenti - http://codewiz.org/ \X/ Sugar Labs - http://sugarlabs.org/ _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel