[pve-devel] Tickless kernel or not

[Stefan Priebe - Profihost AG]

Am 05.08.2015 um 16:48 schrieb Dietmar Maurer:
>>> Redhat uses since RHEL7 a fully tickless kernel. Options:
>>> CONFIG_NO_HZ=y
>>> CONFIG_NO_HZ_FULL=y
>>> CONFIG_RCU_FAST_NO_HZ=n
>>> CONFIG_HZ_1000=y
>>> CONFIG_HZ=1000
>>>
>>> PVE now uses:
>>> CONFIG_NO_HZ=y
>>> CONFIG_NO_HZ_IDLE=y
>>> CONFIG_RCU_FAST_NO_HZ=y
>>> CONFIG_HZ_250=y
>>> CONFIG_HZ=250
>>
>> I just use the default config provided by RH/Ubuntu for that.
>>
>> Does it matter somehow?
> 
> Reading the docs:
> 
> https://www.kernel.org/doc/Documentation/timers/NO_HZ.txt
> 
> seems the current options are preferred?

Might be i was just wondering cause RHEL 7 uses:
CONFIG_NO_HZ=y
CONFIG_NO_HZ_FULL=y
CONFIG_RCU_FAST_NO_HZ=n
CONFIG_HZ_1000=y
CONFIG_HZ=1000

Will try todo some benchmarks.

Greets,
Stefan