Hi Keng-Yu, In comment #4, you mentioned there was an improvement in the performance on the Sapphire Rapids CPU with HBM, how exactly did you quantify that?
-- 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/2008745 Title: [SRU] Intel Sapphire Rapids HBM support needs CONFIG_NUMA_EMU Status in linux package in Ubuntu: Incomplete Status in linux source package in Jammy: Confirmed Status in linux source package in Kinetic: New Status in linux source package in Lunar: Incomplete Bug description: [Impact] Currently Ubuntu kernel has this kernel config disabled. But in some cases, Intel's Sapphire Rapids High Bandwith Memory (SPR-HBM) needs this option. Memory bandwidth has been a bottleneck of increasingly memory bound workloads. Sapphire Rapids plus HBM is specifically targeted to cater to these workloads, traditionally served using overprovisioning of memory devices. Please search the keyword "fake numa" in https://community.intel.com/t5/Blogs/Products-and- Solutions/HPC/Enabling-High-Bandwidth-Memory-for-HPC-and-AI- Applications-for/post/1335100 [Fix] Enable CONFIG_NUMA_EMU in our kernel config for 5.15 and later [Test Plan] [Where problems could occur] The regression risk is low [Other Info] Jammy https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/jammy/+ref/lp_2008745_config_numa_emu Kinetic https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/kinetic/+ref/lp_2008745_config_numa_emu_kinetic Lunar https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/lunar/+ref/config_numa_emu_lunar To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2008745/+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
