Oracle released The second functional update for the Unbreakable Enterprise Kernel R6 kernel, positioned for use in the Oracle Linux distribution as an alternative to a regular package with a kernel from Red Hat Enterprise Linux. The kernel is available for architectures x86_64 and arm64 (AARCH64). The source texts of the kernel, including a breakdown for individual patches, Posted on in the public Git- Oracle repository.
The Unbreakable Enterprise Kernel 6 package is based on the Linux 5.4 kernel (UEK R5 based on the kernel 4.14), which is supplemented with new features, optimizations and corrections, and also verified for compatibility with most applications running in RHEL, and specially optimized to work with Oracle Industrial Software and Equipment. Installation and SRC packets with a UEK R6 core are prepared for Oracle Linux 7.x and 8.x .
Basic Change :
- For Cgroups Added SLAB Memory Controller (Slab Memory Controller), which is notable for the transfer of SLAB accounting from the level of memory pages to the level of the kernel objects, which makes it possible to share the Slab pages in different CGroup, instead of the selection of individual SLAB caches for each CGroup. The proposed approach allows you to increase the efficiency of using SLAB, to 50% reduce the size of the memory used for SLAB, significantly reduce the overall memory consumption of the kernel and reduce memory fragmentation.
- For Mellanox Connectx-6 DX devices, a new VPDA driver is added with VDPA framework support (VHOST Data Acceleration), which allows you to use hardware acceleration for I / O based on Virtio.
- from the Linux 5.9 kernel are transferred to the improvements associated with NVME devices.
- changed corrections and improvements for BTRFS file systems, CIFS, EXT4, NFS, OCFS2 and XFS.
- Drivers updated, including LPFC 12.8.0.5 (Broadcom Emulex Lightpulse Fiber Channel SCSI) with support for 256 gigabit mode for SCSI Fiber Channel, MPT3SAS 36.100.00.00 (LSI MPT Fusion SAS 3.0), QLA2XXX 0.02.00.103-K (QLOGIC Fiber Channel HBA).
- Added experimental support for VPN WireGuard, implemented at the kernel level.
- in NFS Added experimental support for direct copying the files between servers defined in NFS 4.2
- In the task scheduler, an experimental ability to limit the parallel execution of important tasks on different CPU cores to block leakage channels associated with the use of a common cache in the CPU are implemented.
Specifications