Thanks for reply

what is CONFIG_NO_HZ

can we enable CONFIG_NO_HZ and CONFIG_HZ both in our config

and what the drawback of dynamic CONFIG_NO_HZ tick.





On Tue, Jun 26, 2012 at 10:47 AM, Mulyadi Santosa <mulyadi.santosa@gmail.com

wrote:

Hi... :)

On Tue, Jun 26, 2012 at 12:10 PM, solmac john [off-list ref]
wrote:

quoted

I am using ARM multicore board and by default

okay, I am answering it from what I know about HZ impact on x86...

quoted

CONFIG_HZ=250

looks good... a middle safe number, not too high not too low...

quoted

Query: - 1- How to decide HZ for particular hardware

it's you who decide...do you want finer grained timer? or coarse one?

the impact is usually toward latency and responsiveness....together
with preemption model you choose actually.

quoted

              2- Which is the best open source tool to test system
performance from given HZ.

run your application in that platform and see if it gives you impact.
from my experience, unless you need application that is sensitive in
timing such as MIDI sequencer, you won't notice the difference.

--
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

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

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