Kernel Generic Features; Device Drivers - Red Hat ENTERPRISE LINUX 5.5 - RELEASE NOTES 2010 Release Note
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3.2. Kernel Generic Features
The recommended minimal memory requirement on x86 and x86_64 for Red Hat Enterprise Linux 5.5
is now 1GB per logical CPU.
Note
A logical CPU is defined as any entity that can be scheduled (i.e. every core or thread in a
multi-core or multi-thread processor is defined as a logical CPU).
Detecting kernel tasks stuck in the uninterruptible sleep state
In some circumstances, tasks in the kernel may permanently enter the uninterruptible sleep state (D-
State), making the system impossible to shut down. With this update, the Detect Hung Task kernel
thread has been added, providing the ability to detect tasks permanently stuck in the D-State.
This new feature is controlled by the CONFIG_DETECT_HUNG_TASK kernel flag. When set
to "y" tasks stuck in the D-State are detected; when set to n it is off. The default value for the
CONFIG_DETECT_HUNG_TASK flag is y.
Additionally, the CONFIG_BOOTPARAM_HUNG_TASK_PANIC flag has been added. When set to y,
a kernel panic is triggered when a task stuck in the D-State is detected. The default value for the
CONFIG_BOOTPARAM_HUNG_TASK_PANIC flag is n.
17
BZ#506059
Signed s390 Kernel Modules
Starting at Red Hat Enterprise Linux 5.5, all s390 kernel modules are now signed.
19
BZ#456181
BZ#448130
,
4. Device Drivers
the hpilo driver for HP iLO/iLO2 management processors has been updated.
The Advanced Linux Sound Architecture (ALSA) has been updated — providing enhanced support for
High Definition Audio (HDA).
the i2c device driver for the iic-bus interface has been updated with support for the SB900 SMBus
controller.
(BZ#516623
the mlx4 driver for Mellanox ConnectX HCA InfiniBand devices has been updated to version 1.4.1
24
BZ#500346
(BZ#514147
17
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=506059
18
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=483665
19
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=456181
20
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=448130
21
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=427709
22
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=525390
23
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=516623
24
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=514147
20
21
BZ#427709
,
22
(BZ#525390
).
23
)
25
)
Kernel Generic Features
18
BZ#483665
5
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