[LAU] A performance step for Fedora 13, instead of cpufreq

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To: Linux Audio User <linux-audio-user@...>
Date: Saturday, September 11, 2010 - 8:20 pm

CPU frequency tuning facilities common in other distros, generally
around the keyword “cpufreq”, weren’t working in Fedora 13. The
‘performance’ modules simply were not there in the standard Fedora
kernels, though a few others were; but even those were not willing to
run. I found this document:

http://docs.fedoraproject.org/en-US/Fedora_Draft_Documentation/0.1/pdf/P...

which led to a very different method. I don’t know some of the details;
especially, I don’t know whether it actually uses the cpufreq bits which
are still there in stock kernels. But it appears to serve the same
function and much better, when checking parameters for CPU, hard drive,
and (of course) jackd usage percentage, the advantage was glaring. The
command line I used (from root) is:

tuned-adm profile latency-performance

Shockingly, and most happily, this setting stays put through a reboot,
it simply sets a large number of lower-level items to modes for minimum
latency and maximum related performance. My jackd percent-usage at rest
went from 4% to 0.4%; with all apps fired up, from 15% to 10%.

J.E.B.

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