Useful add-ons: Recommended kernel 2.6.16 add-ons


2007-02-28 Support for clock synchronization to an external time reference (ETR) v.1 patch (superseded

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For use with "October 2005 stream" superseded by recommended feature patch 19.

linux-2.6.16-s390-etr-v1-october2005.tar.gz MD5 recommended (2007-02-28) ) superseded

kernel (new function): Support for clock synchronization to an external time reference (ETR).

This patch adds support for clock synchronization to an external time reference (ETR). The external time reference sends an oscillator signal and a synchronization signal every 2**20 (2 to the power of 20) microseconds to keep TOD clocks of all connected servers in sync.

For availability two ETR units can be connected to a machine. If the clock deviates for more than the sync-check tolerance all CPUs get a machine check that indicates that the clock is out of sync. If this happens all DASD I/O to XRC enabled devices is stopped until the clock is synchronized again.

The ETR support is activated via two sysfs attributes:

echo 1 > /sys/devices/system/etr/etr0/online
echo 1 > /sys/devices/system/etr/etr1/online

This patch needs an upstream sysfs patch as prerequisite. The upstream patch with git ID 670dd90d81f60ef429cbba54ad235e9207f4d444 needs to be applied before this add-on patch:;a=commitdiff_plain; h=670dd90d81f60ef429cbba54ad235e9207f4d444;

Note that this patch provides a recommended (optional) add-on to the "October 2005 stream", to be applied as last patch on top of patch 13 (or later) and on top of the upstream sysfs patch.

linux-2.6.16.tar.gz (from
+ linux-2.6.16-s390-base-october2005.diff (IBM)
+ linux-2.6.16-s390-01-october2005.diff (IBM)
+ linux-2.6.16-s390-02-october2005.diff (IBM)
+ linux-2.6.16-s390-03-october2005.diff (IBM)
+ linux-2.6.16-s390-04-october2005.diff (IBM)
+ linux-2.6.16-s390-05-october2005.diff (IBM)
+ linux-2.6.16-s390-06-october2005.diff (IBM)
+ linux-2.6.16-s390-07-october2005.diff (IBM)
+ linux-2.6.16-s390-08-october2005.diff (IBM)
+ linux-2.6.16-s390-09-october2005.diff (IBM)
+ linux-2.6.16-s390-10-october2005.diff (IBM)
+ linux-2.6.16-s390-11-october2005.diff (IBM)
+ linux-2.6.16-s390-12-october2005.diff (IBM)
+ linux-2.6.16-s390-13-october2005.diff (IBM)
+ sysfs patch (see;a=commitdiff_plain; h=670dd90d81f60ef429cbba54ad235e9207f4d444;
hp=1740757e8f94c6899705eb6f5434de9404992778) + linux-2.6.16-s390-etr-v1-s390-october2005.diff (IBM)

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