https://github.com/torvalds/linux
The PID assumes that samples are of equal time, which for a deferable timers this is not true when the system goes idle. This causes the PID to take a long time to converge to the min P state and depending on the pattern of the idle load can make the P state appear stuck. The hold-off value of three sample times before using the scaling is to give a grace period for applications that have high performance requirements and spend a lot of time idle, The poster child for this behavior is the ffmpeg benchmark in the Phoronix test suite. Cc: 3.14+ <stable@vger.kernel.org> # 3.14+ Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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intel_pstate: add sample time scaling
File | Mode | Size |
---|---|---|
Documentation | ||
arch | ||
block | ||
crypto | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
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mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.gitignore | -rw-r--r-- | 1.1 KB |
.mailmap | -rw-r--r-- | 4.4 KB |
COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 93.6 KB |
Kbuild | -rw-r--r-- | 2.5 KB |
Kconfig | -rw-r--r-- | 252 bytes |
MAINTAINERS | -rw-r--r-- | 272.1 KB |
Makefile | -rw-r--r-- | 50.5 KB |
README | -rw-r--r-- | 18.3 KB |
REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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