https://bugs.freedesktop.org/show_bug.cgi?id=50657

--- Comment #6 from Thomas Lindroth <thomas.lindroth at gmail.com> 2012-06-13 
06:56:07 PDT ---
I've figured out what cause the performance increase. When dmesg gets flooded
with messages syslog use 100% cpu for a while. Performance increase during that
time. The same thing can be achieved by running while true;do true;done. I
guess it has something to do with the cpu's power states.

It would be nice to always have that boost. Using fthrottle_mode=0 didn't help.

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