On Thu, Mar 13, 2014 at 02:49:13AM -0400, Jincheng Miao wrote: > In http://libvirt.org/formatdomain.html#elementsTime , we could find there are > three attributes of catchup tickpolicy: limit, threshold and slew. > > " > The catchup element has three optional attributes, each a positive integer. > The attributes are threshold, slew, and limit. > " > The xml format likes: > <clock offset='utc'> > <timer name='rtc' tickpolicy='catchup'> > <catchup slew='123'/> or <catchup threshold='123'/> or <catchup limit='123'/> > </timer> > </clock> > > But there is no further explanation. > Does anyone know what's the meaning of these attributes ? > What an interesting question. At first I thought the meanings are the same as in ntpd(1) and other time-synchonizing apps. But then I looked into the code to see what we're passing to hypervisors and it seems like since 2010, when this was added, these values were never used. [Cc-ing Laine as he is the author of commit 8bf6799b] I can't be sure though. Laine, do you recall any usage of these settings? Martin
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