Hi,

AFAIK.

If you enable CONFIG_NO_HZ, then there is no meaning of HZ.
If CPU is heavy loaded it run with 10ms, and it idle then timer tick is off.

2. drawback of dynamic CONFIG_NO_HZ tick
a) slow response (less interactive system)



On Fri, Jun 29, 2012 at 9:36 AM, Mulyadi Santosa
[off-list ref] wrote:

Hi...

On Thu, Jun 28, 2012 at 6:21 PM, solmac john [off-list ref] wrote:

quoted

Thanks for reply

what is CONFIG_NO_HZ

it enables so called dynamic tick....

quoted

can we enable CONFIG_NO_HZ and CONFIG_HZ both in our config

yup...that's fine...even better, it's recommended nowadays to reduce
power consumption at certain degree.

quoted

and what the drawback of dynamic CONFIG_NO_HZ tick.

uhm, some people said to me that in certain combination, config_no_hz
will introduce higher latency. This is due to the cost of occasional
timer rearming, instead of classic approach where timer is programmed
to shot regularly. But, if your setup is not very latency sensitive,
the overhead is most likely negligible.

--
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

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