Kernel patches

2004-01-30 kernel 2.4.21 On-demand timer patch 02 ("June 2003") (superseded)

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linux-2.4.21-s390-timer-02-june2003.tar.gz / MD5 recommended (2004-01-30)

On demand timer patch:

Category operating system.
Contains a patch for the linux kernel 2.4.21 that will switch off the regular 100 hz interrupts while a cpu is idle. This saves some cpu cycles in an idle linux image. In short if you are running many images under VM the on demand timers are useful but you probably don't want to use it running under LPAR or native.
The patch introduces a configuration option CONFIG_NO_IDLE_HZ that lets you choose between the old and the new behaviour. If this option is selected the run-time switch /proc/sys/kernel/hz_timer allows the administrator to enable or disable the 100 hz interrupts in idle.

linux-2.4.21-s390-timer-02-june2003.diff is a complete replacement for linux-2.4.21-s390-timer-01-june2003.diff

The patch covers changes necessary for the Virtual Timer Interface.

To create the complete kernel sources, apply all IBM kernel 2.4.21 patches on top of linux-2.4.21.tar.gz (see www.kernel.org) and as last patch:

+ linux-2.4.21-s390-timer-02-june2003.diff (IBM)

This timer-02-june2003 patch fits on top of the "June 2003 stream" kernel patches from linux-2.4.21-s390-09-june2003 up to (including) linux-2.4.21-s390-10-june2003.

Contact the IBM team

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