This change was made by a bot.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Tags added: artful
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https://bugs.launchpad.net/bugs/1759787
Title:
Very inaccurate TSC clocksource on HP ProLiant DL380 Gen10 with kernel
4.13
Status in linux package in Ubuntu:
Confirmed
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
https://people.canonical.com/~paulgear/ntp/.
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
AlsaDevices:
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:
CurrentDmesg:
[ 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'
Lsusb:
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
PciMultimedia:
ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic
root=UUID=b33fdcbd-a949-41a0-86d2-03d0c6808284 ro console=tty0
console=ttyS0,115200
RelatedPackageVersions:
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)
WifiSyslog:
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.modalias:
dmi:bvnHPE:bvrU30:bd02/15/2018:svnHPE:pnProLiantDL380Gen10:pvr:rvnHPE:rnProLiantDL380Gen10:rvr:cvnHPE:ct23:cvr:
dmi.product.family: ProLiant
dmi.product.name: ProLiant DL380 Gen10
dmi.sys.vendor: HPE
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