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On 26/03/12 19:00, Simon Waters wrote: > In September 2010 I asked here when "jiffies" are available as a > clocksource in Linux. > > Same question - but now I need the answer as the evil workaround started > failing. > > In particular this is a XEN HVM guest. > The only available clocksource currently is acpi_pm and this is not stable. > > So I think I need a new kernel or settings that get me "jiffies" as a > clock source but I can't find any useful explanation of when "jiffies" > is available as a clock source or even if it is listed in > "available_clocksource" when it is available, or whether I need to > append kernel options to get it listed. > > None of my systems list "jiffies" or other free running clock source. > Most list "tsc hpet acpi_pm", some only "acpi_pm" but then they are all > Debian so it is unsurprising they are fairly uniform. > > So when is it listed? > > Even if you don't know please feel free to send me the output of these > commands (offlist?) for me to discover if there is a pattern: > > $ uname -a > $ cat /sys/devices/system/clocksource/clocksource/available_clocksource > > http://wiki.debian.org/Xen The section on clocksources has all you need. For some reason Xen domUs seem to historically be plagued with timekeeping bugs, I've run into this before myself. Mat -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq