Public bug reported:
Below is result of perf report:
................................
│ mfence
▒
│ mov %gs:0x14204,%rax
▒
│ clflus -0x3ff8(%rax)
▒
│ mfence
▒
│ 90: xor %edx,%edx
▒
│ mov %gs:0x14204,%rsi
▒
│ mov %rdx,%rcx
▒
│ lea -0x3ff8(%rsi),%rax
▒
│ monito %rax,%rcx,%rdx
▒
20,00 │ mov -0x3ff8(%rsi),%rax
▒
│ test $0x8,%al
▒
│ ↓ jne be
▒
│ mov $0x1,%ecx
▒
│ mov %r12,%rax
▒
│ mwait %rax,%rcx
▒
60,00 │ be: mov %gs:0x14204,%rax
▒
20,00 │ lock andb $0xdf,-0x3ff6(%rax)
▒
│ mfence
▒
│ mov -0x3ff8(%rax),%rax
▒
│ test $0x8,%al
▒
│ ↓ je e8
▒
│ andl $0x7fffffff,%gs:0x7eb92008(%rip) # 0xd350
▒
│ e8: test %ebx,0xa36972(%rip)
▒
│ ↓ jne f7
▒
│ xor %edi,%edi
........................
I have one patch wich try to solve this issue .
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-28-generic 4.4.0-28.47
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: asu 3230 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Jul 3 12:49:40 2016
InstallationDate: Installed on 2016-04-29 (64 days ago)
InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.1)
IwConfig:
lo no wireless extensions.
enp1s0 no wireless extensions.
MachineType: Olidata S.p.A. ALABAMA
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-28-generic
root=/dev/mapper/192--168--0--108--vg-root ro
RelatedPackageVersions:
linux-restricted-modules-4.4.0-28-generic N/A
linux-backports-modules-4.4.0-28-generic N/A
linux-firmware 1.157.1
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/08/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: S0101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: To be filled by O.E.M.
dmi.board.vendor: To be filled by O.E.M.
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrS0101:bd07/08/2008:svnOlidataS.p.A.:pnALABAMA:pvrToBeFilledByO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: ALABAMA
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: Olidata S.p.A.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug xenial
** Patch added: "Tested on linux-4.6.2"
https://bugs.launchpad.net/bugs/1598555/+attachment/4694602/+files/fix_stall_mwait_idle_with_hints.patch
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https://bugs.launchpad.net/bugs/1598555
Title:
On intel_idle function issue.
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