Hi Skipper, thanks for sharing the qemu cmdline, there is nothing odd in this and I can run a system like that (not a win 10 guest) just fine.
What about the per thread stats I asked, which threads are busy and where do they consume time? Depending on your experience you could even check "perf kvm stat" and such to see which exists you trigger (unless it is mostly in guest anyway). @Kernel Team - have you had similar reports? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1767857 Title: Kernel 4.4.0-122 Breaks qemu-system-x86 Status in linux package in Ubuntu: Confirmed Status in qemu package in Ubuntu: Incomplete Bug description: Fully updated xubuntu 16.04 running kernel 4.4.0-122 breaks qemu- system-x86: black screen displays and qemu-system-x86 runs at 100% cpu indefinitely. Boot the same system with kernel 4.4.0-119 and qemu- system-x86 works fine running a Windows 10 VM. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: qemu-system-x86 1:2.5+dfsg-5ubuntu10.25 ProcVersionSignature: Ubuntu 4.4.0-122.146-generic 4.4.117 Uname: Linux 4.4.0-122-generic i686 ApportVersion: 2.20.1-0ubuntu2.16 Architecture: i386 CurrentDesktop: XFCE Date: Sun Apr 29 15:58:25 2018 InstallationDate: Installed on 2014-04-29 (1460 days ago) InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2) KvmCmdLine: COMMAND STAT EUID RUID PID PPID %CPU COMMAND kvm-irqfd-clean S< 0 0 394 2 0.0 [kvm-irqfd-clean] MachineType: Dell Inc. Inspiron 518 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-122-generic root=UUID=7cffb293-c044-4b2c-8343-dc50fd16db97 ro --verbose nosplash nmi_watchdog=0 SourcePackage: qemu UpgradeStatus: Upgraded to xenial on 2016-08-10 (627 days ago) dmi.bios.date: 03/30/2009 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.0.8 dmi.board.name: 0K068D dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 3 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: OEM dmi.modalias: dmi:bvnDellInc.:bvr1.0.8:bd03/30/2009:svnDellInc.:pnInspiron518:pvr00:rvnDellInc.:rn0K068D:rvrA00:cvnDellInc.:ct3:cvrOEM: dmi.product.name: Inspiron 518 dmi.product.version: 00 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1767857/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
