Patch  oval:com.redhat.rhba:def:20130386
RHBA-2013:0386: tuned bug fix update (None)  

The tuned packages contain a daemon that tunes system settings dynamically. It does so by monitoring the usage of several system components periodically.
This update fixes the following bugs:
* Red Hat Enterprise Linux 6.1 and later enters processor power-saving states more aggressively. This could result in a small performance penalty on certain workloads. With this update, the pmqos-static.py daemon has been added to the tuned packages, which allows to set the requested latency using the kernel Power Management QoS interface. It is run when the "latency-performance" profile is activated and it sets cpu_dma_latency=0, which keeps the CPU in C0 state, thus making the system as responsive as possible. (BZ#714180)
* When the ELEVATOR_TUNE_DEVS option was set to a disk device in the /etc/sysconfig/ktune file instead of providing a disk scheduler control file, the scheduler setting was not written to a disk scheduler control file but directly into the disk device file. Consequently, contents of the disk could become corrupted. With this update, the value of ELEVATOR_TUNE_DEVS is checked and only the disk scheduler control file is allowed for writing. As a result, an invalid value of ELEVATOR_TUNE_DEVS is detected in the described scenario so that the disk contents damage can be prevented. (BZ#784308)
* When the tuned daemon run with the "enterprise-storage" profile enabled and a non-root, non-boot disk partition from a device with write-back cache was mounted, tuned remounted the partition with the "nobarriers" option. If a power failure occurred at that time, the file system could become corrupted. With this update, tuned can detect usage of write-back cache on devices communicating with kernel via SCSI. In these cases, "nobarriers" is now disabled, thus preventing this bug in the described scenario. (BZ#801561)
* Previously, when the tuned service was started, the tuned PID file was created with world-writable permissions. This bug has been fixed and the /var/run/tuned/tuned.pid file is now created with correct permissions as expected. (BZ#845336)
* On a machine with hot-plug disk devices with the "enterprise-storage" profile activated, a new disk device could be added into the system, or the disk could be removed and inserted back. In such a scenario, the scheduler and read-ahead settings from the profile were not applied on the newly-added disks. With this update, a new udev rule has been added, which restarts the ktune daemon whenever a new disk device is added, thus fixing this bug. (BZ#847445)
* The transparent hugepage kernel thread could interfere with latency-sensitive applications. To lower the latency, the transparent hugepages are now disabled in the latency-performance tuned profile. (BZ#887355)
* Previously, non-root, non-boot partitions were re-mounted using the "nobarrier" option to improve performance. On virtual guests, this could lead to data corruption if power supply was suddenly interrupted, because there was usually a host cache in transfer. This bug has been fixed and the virtual-guest profile no longer re-mounts partitions using "nobarrier". (BZ#886956)
Users of tuned are advised to upgrade to these updated packages, which fix these bugs.
Create Date: 2013-02-20 Last Update Date: 2013-02-20

Affected Platforms/Products

Affected Products (CPE + CVE references)
  • Redhat  Enterprise Linux  
  • cpe:/o:redhat:enterprise_linux:6::client
  • cpe:/o:redhat:enterprise_linux:6::computenode
  • cpe:/o:redhat:enterprise_linux:6::server
  • cpe:/o:redhat:enterprise_linux:6::workstation
Platforms: unix (from OVAL definitions)
  • Red Hat Enterprise Linux 6

References

Criteria

The patch should be installed
IF : Any one of the following are true
IF : Red Hat Enterprise Linux must be installed
WARNING! Unknown test oval:com.redhat.rhba:tst:20070026004. Please see help for possible reasons
IF : All of the following are true
IF : Red Hat Enterprise Linux 6 is installed
WARNING! Unknown test oval:com.redhat.rhba:tst:20111656003. Please see help for possible reasons
IF : Any one of the following are true
IF : All of the following are true
IF : tuned-utils is earlier than 0:0.2.19-11.el6
WARNING! Unknown test oval:com.redhat.rhba:tst:20130386003. Please see help for possible reasons
IF : tuned-utils is signed with Red Hat redhatrelease2 key
WARNING! Unknown test oval:com.redhat.rhba:tst:20130386004. Please see help for possible reasons
IF : All of the following are true
IF : tuned is signed with Red Hat redhatrelease2 key
WARNING! Unknown test oval:com.redhat.rhba:tst:20130386002. Please see help for possible reasons
IF : tuned is earlier than 0:0.2.19-11.el6
WARNING! Unknown test oval:com.redhat.rhba:tst:20130386001. Please see help for possible reasons

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