• Miroslav Lichvar's avatar
    igb: shorten maximum PHC timecounter update interval · 094bf4d0
    Miroslav Lichvar authored
    The timecounter needs to be updated at least once per ~550 seconds in
    order to avoid a 40-bit SYSTIM timestamp to be misinterpreted as an old
    timestamp.
    
    Since commit 500462a9
    
     ("timers: Switch to a non-cascading wheel"),
    scheduling of delayed work seems to be less accurate and a requested
    delay of 540 seconds may actually be longer than 550 seconds. Shorten
    the delay to 480 seconds to be sure the timecounter is updated in time.
    
    This fixes an issue with HW timestamps on 82580/I350/I354 being off by
    ~1100 seconds for few seconds every ~9 minutes.
    
    Cc: Jacob Keller <jacob.e.keller@intel.com>
    Cc: Richard Cochran <richardcochran@gmail.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: default avatarMiroslav Lichvar <mlichvar@redhat.com>
    Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
    Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
    094bf4d0