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Oracle® LinuxRelease Notes for Unbreakable Enterprise Kernel Release 3E48380-04February 2014

DTrace4DTrace 0.4 in UEK R3 has the following additional features compared with DTrace 0.3.2 in UEK R2:• In UEK R2, you had to install separately avai

DTrace5• The DTrace header files in the kernel, kernel modules, and DTrace user-space utility have beenrestructured to provide better support for cust

File Systems6• It is now possible to obtain correct value for the ERR registers.• For more information about DTrace, refer to the Oracle Linux 6 Admin

Memory Management7• The fsync() system call writes the modified data of a file to the hard disk. (3.7)• Replacing devices without unmounting or otherw

Networking8oriented, pseudo-RAM device such as Xen Transcendent Memory (tmem) or in-kernel compressedmemory (zmem). (3.5)• Safe swapping is supported

Security9• The perf trace command can be used to record a workload according to a specified script, andto display a detailed trace of a workload that

Virtualization10• Automatic Path Migration (APM)• Active Bonding (AB)• Shared Request Queue (SRQ)• Netfilter (NF)• Support for IB, OFED, and RDS is in

Driver Updates111.3 Driver UpdatesThe Unbreakable Enterprise Kernel supports a large number of hardware and devices. In closecooperation with hardware

Network Adapter Drivers12Supports Open-iSCSI.1.3.2 Network Adapter DriversBroadcom• NetXtreme II network adapter driver (bnx2) version 2.2.3n.• NetXtr

New and Updated Packages13• InfiniBand SCSI RDMA Protocol initiator (ib_srp) version 1.2.Oracle• Reliable Datagram Sockets driver (rds) version 4.1.RD

Oracle® Linux: Release Notes for Unbreakable Enterprise Kernel Release 3Copyright © 2013, 2014, Oracle and/or its affiliates. All rights reserved.Orac

New and Updated Packages14fuse-develfuse-libs• ib-bonding (ip-bond, IPoIB bonding-interface utility)• ibacm (ib_acm daemon for InfiniBand fabrics)ibac

New and Updated Packages15libibumad-static• libibverbs (user-space RDMA (InfiniBand/iWARP) hardware library)libibverbs-devellibibverbs-devel-staticlib

Technology Preview16• rds-tools (RDS utilities)• sdpnetstat (sdpnetstat, InfiniBand SDP diagnostic utility)• srptools (InfiniBand SDP utilities)• unam

17Chapter 2 Known IssuesThis chapter describes the known issues for the Unbreakable Enterprise Kernel Release 3.ACFSOracle ASM Cluster File System (AC

18• Converting an existing ext2, ext3, or ext4 root file system to btrfs does not carry over the associatedsecurity contexts that are stored as part o

19• If you use the -s option to specify a sector size to mkfs.btrfs that is different from the page size, thecreated file system cannot be mounted. By

20Firmware warning messageYou can safely ignore the following firmware warning message that might be displayed on some Sunhardware:[Firmware Warn]: GH

21• To configure connected mode, specify CONNECTED_MODE=yes in the file.• To configure datagram mode, either specify CONNECTED_MODE=no in the file or

222. Shut down and reboot the host system.• The root user in a container can affect the configuration of the host system by setting some /procentries.

23Soft lockup errors when bootingWhen upgrading or installing the UEK R3 kernel on fast hardware, usually with SAN storage attached,the kernel can fai

iiiTable of ContentsPreface ...

24• On virtualized systems that are built on Xen version 3, including all releases of Oracle VM 2 including2.2.2 and 2.2.3, disk synchronization reque

25Chapter 3 Installation and AvailabilityYou can install Unbreakable Enterprise Kernel Release 3 on Oracle Linux 6 Update 4 or newer, runningeither th

Enabling Access to Public Yum Channels265. Click Save Subscriptions.For information about using ULN, see the Oracle Linux Unbreakable Linux Network Us

Upgrading OFED Packages27In this example, access is enabled to the ol6_latest and ol6_UEKR3_latest channels but not to theol6_UEK_latest, ol6_playgrou

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29Appendix A Other ChangesThe following sections describe other features of Unbreakable Enterprise Kernel Release 3 (UEK R3). Themainline version in w

Core Kernel Functionality30• RAID-5 XOR checksumming is optimized by taking advantage of the 256-bit YMM registers introducedby Advanced Vector Extens

Core Kernel Functionality31• Add support for the implementation of SEEK_HOLE and SEEK_DATA in lseek(). (3.1)• Add the ! escape character to / in hostn

Core Kernel Functionality32• The prctl() PR_GET_CHILD_SUBREAPER and PR_SET_CHILD_SUBREAPER options implementsimple process supervision of orphaned pro

Core Kernel Functionality33• The rcutree.rcu_fanout_leaf boot parameter allows the value of RCU_FANOUT_LEAF to beincreased but not decreased. (3.6)• F

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Cryptography34• Add a sysfs node to present frequency transition information for power management. (3.8)A.4 Cryptography• Ablkcipher now support encry

Device Mapper35• Add Tegra AES hardware driver supporting ecb, cbc, ofb, and ansi_x9.31rng modes, and 128, 192and 256-bit key sizes. (3.4)• Add a slic

File Systems36• CEE information and statistics query• Flash configuration• Collect and reset fcport statistics• Configure LUN masking• Configure QoS a

File Systems37• Switching from tree locks to reader/writer locks improves the performance of read and write-intensiveworkloads. (3.1)• Performance imp

File Systems38• Add backup mount option. (3.2)• Allow larger rsize (up to 16 MB) and change the default to 1 MB. (3.2)• Introduce credit-based flow co

Memory Management39• Add persistent function tracing. The kernel can save the function call chain log to a persistent RAMbuffer, which can be decoded

Networking40• Charge the pages dirtied by an exited process to random dirtying tasks. (3.3)• Allow the poll time and call intervals to balance dirty p

Networking41• Reduce the false sharing effect. (3.1)• Reduce CPU overhead of check_leaf() with the route cache disabled. (3.1)• Add support to the vir

Networking42• RCU conversion in TCP allows access to MD5 keys without locking the listener socket. (3.4)• For some workloads, allowing splice() to bui

Networking43interface to the vlan interface if this interface exists. This change allows the iptables REDIRECTtarget work with vlan-on-top-of-bridge c

vPrefaceThe Oracle Linux Unbreakable Enterprise Kernel Release Notes provides a summary of the new features,changes, and known issues in the Unbreakab

Networking44• Add IPv6 REDIRECT target.• Add IPv6 AT support.• Support IPv6 FTP NAT helper.• Support IPv6 IRC NAT helper.• Support IPv6 SIP NAT helper

perf Utility45• Add support for per-association statistics by implementing the SCTP_GET_ASSOC_STATS call for theStream Control Transmission Protocol (

Power Management46• Add --list-opts option to print long option names for use with bash. (3.7)• Add script browser. (3.8)• Add new display options (-F

Storage47• Add environment variable name restriction to TOMOYO. (3.2)• Add socket operation restriction to TOMOYO. (3.2)• Add control for generation o

Virtualization48A.14 Virtualization• Add memory hotplug support for the Xen balloon driver. (3.1)• Add Xen PCI backend driver. (3.1)• Implement discar

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1Chapter 1 New Features and ChangesThe Unbreakable Enterprise Kernel Release 3 (UEK R3) is Oracle's third major release of its heavily testedand

Core Kernel Functionality21.1.3 Core Kernel Functionality• To avoid binary incompatibility in applications that do not understand the 3.x versioning s

Cryptography3• The value of the SCSI error-handling timeout is now tunable. If a SCSI device times out while processingfile system I/O, the kernel att