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| author | Alexander Motin <mav@FreeBSD.org> | 2022-01-10 00:17:43 +0000 |
|---|---|---|
| committer | Alexander Motin <mav@FreeBSD.org> | 2022-01-10 00:25:56 +0000 |
| commit | cb1f5d11366dc9b803f2755d83fe02599830882a (patch) | |
| tree | 4fba7848449dbaf04ae2ef4a0753d3b9aa9daef4 | |
| parent | 7ef56fb0498461edf4bf4c482fd8bc6fa126e0e9 (diff) | |
| download | src-cb1f5d11366dc9b803f2755d83fe02599830882a.tar.gz src-cb1f5d11366dc9b803f2755d83fe02599830882a.zip | |
Reduce minimum idle hardclock rate from 2Hz to 1Hz.
On idle 80-thread system it allows to improve package-level idle state
residency and so power consumption by several percent.
MFC after: 2 weeks
| -rw-r--r-- | sys/kern/kern_clocksource.c | 5 | ||||
| -rw-r--r-- | sys/kern/kern_timeout.c | 5 |
2 files changed, 5 insertions, 5 deletions
diff --git a/sys/kern/kern_clocksource.c b/sys/kern/kern_clocksource.c index dfc9081ba9f6..48e06ee082fc 100644 --- a/sys/kern/kern_clocksource.c +++ b/sys/kern/kern_clocksource.c @@ -239,13 +239,14 @@ getnextcpuevent(int idle) /* Handle hardclock() events, skipping some if CPU is idle. */ event = state->nexthard; if (idle) { - hardfreq = (u_int)hz / 2; - if (tc_min_ticktock_freq > 2 + if (tc_min_ticktock_freq > 1 #ifdef SMP && curcpu == CPU_FIRST() #endif ) hardfreq = hz / tc_min_ticktock_freq; + else + hardfreq = hz; if (hardfreq > 1) event += tick_sbt * (hardfreq - 1); } diff --git a/sys/kern/kern_timeout.c b/sys/kern/kern_timeout.c index 91882ddb5fba..d0fb19661fa4 100644 --- a/sys/kern/kern_timeout.c +++ b/sys/kern/kern_timeout.c @@ -434,8 +434,7 @@ callout_process(sbintime_t now) struct callout_cpu *cc; struct callout_list *sc; struct thread *td; - sbintime_t first, last, max, tmp_max; - uint32_t lookahead; + sbintime_t first, last, lookahead, max, tmp_max; u_int firstb, lastb, nowb; #ifdef CALLOUT_PROFILING int depth_dir = 0, mpcalls_dir = 0, lockcalls_dir = 0; @@ -455,7 +454,7 @@ callout_process(sbintime_t now) else if (nowb - firstb == 1) lookahead = (SBT_1S / 8); else - lookahead = (SBT_1S / 2); + lookahead = SBT_1S; first = last = now; first += (lookahead / 2); last += lookahead; |