[ntp:questions] Ntpd in uninterruptible sleep?

unruh unruh at physics.ubc.ca
Mon Oct 24 13:24:43 UTC 2011


On 2011-10-23, Uwe Klein <uwe at klein-habertwedt.de> wrote:
> A C wrote:
>> More interesting is that the cpu was pegged until I was able to kill and 
>> restart ntpd.  Most of the cpu was devoted to ntpd during this locked up 
>> period.  Simple things like typing at the console were difficult.  It 
>> would take a few seconds for a keypress to register on the screen.  Once 
>> ntpd was restarted the system responded normally and the cpu usage 
>> dropped to normal levels.
>> 
>> This is still version 4.2.6p3.  I should probably go ahead and compile 
>> the most recently released version but I'm at a loss to understand why 
>> it happened.
>
> CPU (over)loaded
> or the system is swapping like mad ?

That would destroy everything ( ie slow everything to a crawl). Also
ntpd is a small program and especially at heightened niceness (which he
said he used) should not get swapped out or affected. 

> ( I'd think it is swapping? )
>
> uwe



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