HZ value changed from 250 to 1000 in the latest updated kernel

[Dmitry Butskoy]

Arjan van de Ven wrote:

>>Dave,
>>As you have appeared here, could you please comment why HZ was changed?
>>
>>I have some confusion on this.
>>First, the upstream kernel has this changed (since 2.6.13 ?) in backward 
>>direction, i.e. from 1000 to 250.
>>    
>>
>
>actually the upstream kernel changed to offer a choice, with 3 options,
>1000, 250 and 100.
>
Sure! But I meant the *upstream default" was chosen to be 250 (not 1000).

>>Second, why Fedora's change is implemented just now (in the middle of 
>>life cycle), but not at distro release boundary?
>>    
>>
>
>does it matter? This is only internally visible to the kernel, not to
>userspace 
>  
>
But these changes are appreciable enough. For production servers (more 
system CPU time), for laptops (less battery life), etc. And note the ntp 
issue discussed here too...


~buc