Re: 1us latency?

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

* Clark Williams | 2015-08-03 13:53:26 [-0500]:

>On Mon, 3 Aug 2015 21:36:26 +0300
>
>Interesting. Betting that's page faults and cache filling. 
>
>I don't think we want to arbitrarily pick some number of cycles for a
>"settle time" (i.e. a grace period for the application to reach steady
>state). Possibly we should add an option for that? Specify some number
>of cycles or some amount of time that where the measurement threads run
>before actual measurements start?
>
>  $ cyclictest --numa -p95 -m --settle=10ms
>
>That would say "run the measurement threads for ten milliseconds before
>actually starting the measurement period". That would allow them to
>fault in and fill cache lines before starting real work.
>
>Anyone else have an opinion?

Wouldn't you have everything in-memory after once cycle of each thread?

>Clark

Sebastian