Previous kernel version: ubuntu@ip-172-31-9-93:~$ uname -a Linux ip-172-31-9-93 4.13.0-16-generic #19-Ubuntu SMP Wed Oct 11 18:35:14 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux ubuntu@ip-172-31-9-93:~$ dmesg|grep TSC [ 0.000000] tsc: Fast TSC calibration using PIT [ 0.000000] [Firmware Bug]: TSC_DEADLINE disabled due to Errata; please update microcode to version: 0x2000014 (or later)
-proposed kernel version: ubuntu@ip-172-31-9-93:~$ uname -a Linux ip-172-31-9-93 4.13.0-17-generic #20-Ubuntu SMP Mon Nov 6 10:04:08 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux ubuntu@ip-172-31-9-93:~$ dmesg|grep TSC [ 0.000000] tsc: Fast TSC calibration using PIT [ 0.071013] TSC deadline timer enabled ** Tags removed: verification-needed-artful ** Tags added: verification-done-artful -- 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/1724612 Title: x86/apic: Update TSC_DEADLINE quirk with additional SKX stepping Status in linux package in Ubuntu: In Progress Status in linux source package in Artful: Fix Committed Bug description: An upstream commit added Intel cpu model/microcode checks to disable TSC_DEADLINE due to cpu errata: commit bd9240a18edfbfa72e957fc2ba831cf1f13ea073 Author: Peter Zijlstra <pet...@infradead.org> Date: Wed May 31 17:52:03 2017 +0200 x86/apic: Add TSC_DEADLINE quirk due to errata That commit is included in the Ubuntu kernels starting at artful v4.13. However, the commit includes a check for Skylake Xeons, but the microcode update version number differs based on Skylake Xeon stepping, so an additional commit is required to correctly check the microcode level of both stepping 3 and stepping 4 Skylake Xeons, and disable/enable TSC_DEADLINE appropriately. Upstream commit that corrects the check is: commit 616dd5872e52493863b0202632703eebd51243dc Author: Len Brown <len.br...@intel.com> Date: Wed Oct 11 17:16:04 2017 -0400 x86/apic: Update TSC_DEADLINE quirk with additional SKX stepping Without the additional commit, Skylake Xeon stepping-3 cpus with the fixed microcode version will incorrectly have their TSC_DEADLINE disabled. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1724612/+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
