Bug 8858 - NO_HZ but I can set the ticrate?
Summary: NO_HZ but I can set the ticrate?
Status: REJECTED INVALID
Alias: None
Product: Timers
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Thomas Gleixner
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2007-08-07 10:27 UTC by Patrick Matthäi
Modified: 2008-01-02 07:23 UTC (History)
2 users (show)

See Also:
Kernel Version: 2.6.23.9
Subsystem:
Regression: ---
Bisected commit-id:

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Description Patrick Matthäi 2007-08-07 10:27:59 UTC 
Most recent kernel where this bug did not occur: none
Problem Description:

Hello,

If I activate the Tickless System in menuconfig, I still can set up and down the Timer Frequency, for example to 250 or 1000 HZ.
I think the right way is, that the last option is unavailable if the Tickless System is activated.

Regards,
Patrick
Comment 1 Thomas Gleixner 2008-01-02 07:23:50 UTC 
No, the tickrate is still valid for several things:

scheduler tick, when the box is not idle
time base for jiffie driven timers

The tickless system switches off the tick only when the box is going idle and the next known (timer) event is more than one tick away.

Thanks,
       tglx
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