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On 26/03/12 21:22, Gordon Henderson wrote: > >> Who knows? How would you find out? > > Really don't know Seems emailing the relevant kernel subsystem maintainers gets you a response within the hour ;) Apparently enabling "jiffies" switches off the high resolution timers, since you can't switch between high res and low res timers (except at boot), jiffies is removed because you can't just do "echo jiffies >/sys/..blah..blah../current_clocksource". See also: http://elinux.org/High_Resolution_Timers I've seen comments that possibly postgres expects high resolution timers. On the other hand if you have a borked Xen 3 guest with HVM and SMP you should have used KVM, or Citrix, or upgraded to Xen 4 or somehow not start from here... Meantime our boxes have gone from drastic time issues to not great but ntpd doesn't complain any more. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq