I installed the 3.18-rc2 packages but when I tried to boot into it I got an error message saying that it couldn't find the root device. I compared the ID of the root device in the boot options for the 3.18 kernel to the ones in the 3.16 kernel and couldn't find any differences. It seems to be referencing the exact same UUID for the root device at least.
Is there something I can try to fix this? -- 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/1386473 Title: Not using all cores after upgrade to 14.10 Status in “linux” package in Ubuntu: Incomplete Bug description: I have a computer with two cpus with 4 cores each (physical) but htop is only showing activity on two of these 8 cores (number 1 and 3). Also, if I run "stress -c 8" top shows only 25% cpu usage. I've rebooted the machine and the problem persists. I also took a look at the BIOS settings and found nothing there that looked suspicious. If I run 'stress -c 8' only two cores go to 100% in htop as stated above (cores 1 and 3). If I run 'stress -c 1', one core goes to 100% (either core 1 or 3). If I run taskset -cp <coreid> <pid> I can control which core the process is run on. I can actually move it to any core that I want (1, 3 or any other one)! So the cores are there... the kernel just doesn't seem to use it unless I explicitly tell it to with taskset. I've verified that this is a regression when moving from [lxk]ubuntu 14.04 to 14.10. I used pristine lubuntu 14.10 and 14.04 usb sticks to test this out and verified that a cpu sysbench test using 8 threads took ~15 sec on 14.04 but ~55 sec on 14.10. The computer this is happening on is a Dell Precision T5400 tower workstation. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-23-generic 3.16.0-23.31 ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4 Uname: Linux 3.16.0-23-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 CRDA: Error: [Errno 2] No such file or directory: 'iw' CurrentDesktop: KDE Date: Tue Oct 28 00:46:25 2014 HibernationDevice: RESUME=UUID=20536d9f-ef05-46dd-a104-47367e464fcd InstallationDate: Installed on 2014-02-05 (264 days ago) InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Release amd64 (20131016) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: Dell Inc. Precision WorkStation T5400 ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic root=UUID=28fc4c4c-cecd-4abe-a788-28f69e745845 ro splash quiet RelatedPackageVersions: linux-restricted-modules-3.16.0-23-generic N/A linux-backports-modules-3.16.0-23-generic N/A linux-firmware 1.138 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to utopic on 2014-10-24 (3 days ago) dmi.bios.date: 02/01/2008 dmi.bios.vendor: Dell Inc. dmi.bios.version: A01 dmi.board.name: 0RW203 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 7 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA01:bd02/01/2008:svnDellInc.:pnPrecisionWorkStationT5400:pvr:rvnDellInc.:rn0RW203:rvrA00:cvnDellInc.:ct7:cvr: dmi.product.name: Precision WorkStation T5400 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1386473/+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
