On Sun, Jan 17, 2010 at 1:33 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> Tbh I don't think we've ever done a detailed
> analysis of ntp performance on Xen before -- this is something we might be
> able to improve.
just fyi -- this may be all old info for you -- this
 "Kernel Model for Precision Timekeeping"
 http://www.eecis.udel.edu/~mills/ntp/html/kern.html
and the site/info around it, seem to be the authoritative resource on
timekeeping with ntp (function, debugging, etc).
it's been a great resource in understanding the expected behavior of ntp.
i also found good general guidance in
 "Network Time Protocol (NTP) Overview and Configuration: An Internet2 Cookbook"
 http://e2epi.internet2.edu/npw/binder-docs/ntp-cookbook.pdf
although it does include a # of quotes/references to Mills' bias
against Linux, e.g.,
 “I have confronted Linux many, many times with broken this and that
and concluded I will not attempt to examine, fix, or judge anything
Linux. You are on your own.” —David L. Mills, 2004年10月20日
so it's not clear, at least to me, if there are in fact 'deeper'
issues with ntp at hand. hopefully that's gotten better over the
years ...
hth.
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