Re: [Jack-Devel] jack dsp load calculation

On Tue, 29 Dec 2015 14:11:33 -0600
"Chris Caudle" <[hidden]> wrote:

> Keep in mind that a lot of motherboards use system management mode for
> things like checking temperature, and SMM preempts even the kernel,
> so no matter which kernel variant you use that time is lost.  The
> only thing you can do is try to disable options in the BIOS to reduce
> the time spent in SMM.

You can use the hwlatdetect script included with the rt-tests package
together with a kernel module to get an idea about how bad SMM/SMI
affects your system (provided that it has a well working TSC
implementation).

My i7 desktop has a kernel scheduling latency well under 100us, while
my laptop seems to come in at 120us or so (both -rt patched).

-- 

   Joakim

1451421991.16185_0.ltw:2,a <20151229214613.2b934194 at balder dot valhalla dot alchemy dot lu>