path: root/drivers/net/ethernet/intel/igb/e1000_phy.h
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authorMiroslav Lichvar <mlichvar@redhat.com>2018-10-26 19:13:00 +0200
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2018-11-06 12:54:27 -0800
commit4c9b658eeaefedd402a59e858d8ac3bfdf6153e3 (patch)
tree1131ab8b79b517f4554c4a3141a58ca96c6adeef /drivers/net/ethernet/intel/igb/e1000_phy.h
parentice: Fix the bytecount sent to netdev_tx_sent_queue (diff)
igb: shorten maximum PHC timecounter update interval
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 500462a9de65 ("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. Also, the PHC may be adjusted to run up to 6% faster than real time and the system clock up to 10% slower. Shorten the delay to 360 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: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> Acked-by: Jacob Keller <jacob.e.keller@intel.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/igb/e1000_phy.h')
0 files changed, 0 insertions, 0 deletions