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  Very inaccurate TSC clocksource on HP ProLiant DL380 Gen10 with kernel

Status in linux package in Ubuntu:
Status in linux source package in Artful:

Bug description:
  On kernel 4.13.0-37-generic, HP ProLiant DL380 Gen10 systems have been
  observed with very large clock offsets, as measured by NTP.  Over the
  past few days on one of our production systems, we've used 3 different
  kernels: https://pastebin.ubuntu.com/p/nDkkgRqdtv/

  All of these kernels default to the TSC clocksource, which is supposed
  to be very reliable on Skylake-X CPUs.  On 4.4 (linux-image-generic-
  lts-xenial) it works as expected; on 3.13 (trusty default kernel) it
  works a little worse, and on 4.13 (linux-image-generic-hwe-16.04) it
  is much worse.  Today I switched 4.13 from the TSC clocksource to the
  HPET clocksource and it improved the situation dramatically.

  I've produced loopstats & peerstats graphs from NTP corresponding to
  the dates in the pastebin above and placed them at

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-4.13.0-37-generic 4.13.0-37.42
  ProcVersionSignature: User Name 4.13.0-37.42~16.04.1-generic 4.13.13
  Uname: Linux 4.13.0-37-generic x86_64
   total 0
   crw-rw---- 1 root audio 116,  1 Mar 27 18:26 seq
   crw-rw---- 1 root audio 116, 33 Mar 27 18:26 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.27
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
   [ 6280.259121] perf: interrupt took too long (2505 > 2500), lowering 
kernel.perf_event_max_sample_rate to 79750
   [10463.378558] perf: interrupt took too long (3133 > 3131), lowering 
kernel.perf_event_max_sample_rate to 63750
   [32314.949747] perf: interrupt took too long (4000 > 3916), lowering 
kernel.perf_event_max_sample_rate to 50000
   [129804.100274] clocksource: Switched to clocksource hpet
   [132747.312089] perf: interrupt took too long (5004 > 5000), lowering 
kernel.perf_event_max_sample_rate to 39750
  Date: Thu Mar 29 07:45:22 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 002: ID 0bda:0329 Realtek Semiconductor Corp. 
   Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 002 Device 002: ID 0424:2660 Standard Microsystems Corp. Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: HPE ProLiant DL380 Gen10
  ProcFB: 0 mgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic 
root=UUID=b33fdcbd-a949-41a0-86d2-03d0c6808284 ro console=tty0 
   linux-restricted-modules-4.13.0-37-generic N/A
   linux-backports-modules-4.13.0-37-generic  N/A
   linux-firmware                             1.127.24
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/15/2018
  dmi.bios.vendor: HPE
  dmi.bios.version: U30
  dmi.board.name: ProLiant DL380 Gen10
  dmi.board.vendor: HPE
  dmi.chassis.type: 23
  dmi.chassis.vendor: HPE
  dmi.product.family: ProLiant
  dmi.product.name: ProLiant DL380 Gen10
  dmi.sys.vendor: HPE

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