From: bugzilla-daemon@bugzilla.kernel.org
To: cpufreq@vger.kernel.org
Subject: [Bug 69821] setting CONFIG_HZ_PERIODIC locks cpu at the lowest frequency using ONDEMAND
Date: Tue, 15 Dec 2015 00:12:02 +0000 [thread overview]
Message-ID: <bug-69821-12968-3QWufT2Out@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-69821-12968@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=69821
--- Comment #4 from Chen Yu <yu.c.chen@intel.com> ---
CONFIG_NO_HZ_FULL is using ktime_get to get the idle time in
get_cpu_idle_time_us, it is based on clock source, while if the kernel config
is set with CONFIG_HZ_PERIODIC , the governor might get idle time by
jiffies(tick, minimum unit of 4 millisecond),
the former is more accurate than the latter, this might be one of the reason
for the problem. I can try to reproduce and take a look.
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next prev parent reply other threads:[~2015-12-15 0:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-69821-12968@https.bugzilla.kernel.org/>
2014-02-07 2:40 ` [Bug 69821] setting CONFIG_HZ_PERIODIC locks cpu at the lowest frequency using ONDEMAND bugzilla-daemon
2014-02-11 0:52 ` bugzilla-daemon
2014-02-11 10:01 ` bugzilla-daemon
2014-06-03 6:14 ` bugzilla-daemon
2015-12-15 0:12 ` bugzilla-daemon [this message]
2015-12-16 2:09 ` bugzilla-daemon
2015-12-16 2:15 ` bugzilla-daemon
2015-12-16 2:43 ` bugzilla-daemon
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