Date: Sun, 21 Sep 2014 13:06:02 +0400 From: Maxim V FIlimonov <che@bein.link> To: Ian Lepore <ian@freebsd.org> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: FreeBSD-11.0-CURRENT on ARM: performance and load average Message-ID: <16223180.9Q4Ic3raYi@quad> In-Reply-To: <1411256769.66615.155.camel@revolution.hippie.lan> References: <7351653.A2UeEk9AA3@quad> <1989123.lKm0QJoZES@quad> <1411256769.66615.155.camel@revolution.hippie.lan>
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On Saturday 20 September 2014 17:46:09 Ian Lepore wrote: > > 60 times as fast doesn't make much sense for changing a divisor to 16. > > Without that patch, what is the output of > > sysctl kern.eventtimer > sysctl kern.timecounter Here it is: root@cubie:~ # sysctl kern.eventtimer kern.eventtimer.et.a10_timer Eventtimer.flags: 3 kern.eventtimer.et.a10_timer Eventtimer.frequency: 24000000 kern.eventtimer.et.a10_timer Eventtimer.quality: 1000 kern.eventtimer.choice: a10_timer Eventtimer(1000) kern.eventtimer.singlemul: 4 kern.eventtimer.idletick: 0 kern.eventtimer.timer: a10_timer Eventtimer kern.eventtimer.periodic: 1 root@cubie:~ # sysctl kern.timecounter kern.timecounter.tc.a10_timer timer0.mask: 4294967295 kern.timecounter.tc.a10_timer timer0.counter: 4271639596 kern.timecounter.tc.a10_timer timer0.frequency: 24000000 kern.timecounter.tc.a10_timer timer0.quality: 1000 kern.timecounter.stepwarnings: 0 kern.timecounter.alloweddeviation: 5 kern.timecounter.hardware: a10_timer timer0 kern.timecounter.choice: a10_timer timer0(1000) dummy(-1000000) kern.timecounter.tick: 1 kern.timecounter.fast_gettime: 1 > > If you repeatedly do "ntpdate -q <some server>" every 15 seconds for a > couple minutes, does the offset stay pretty much the same? (like no big > changes in the first two decimal places) Don't use a server like > pool.ntp.org where you might get a different server every time, instead > do "host pool.ntp.org" and pick one of the IPs and use it every time. > root@cubie:~ # ntpdate time.nist.gov 21 Sep 13:04:55 ntpdate[2236]: adjust time server 24.56.178.140 offset -0.117727 sec root@cubie:~ # ntpdate time.nist.gov 21 Sep 13:04:57 ntpdate[2237]: adjust time server 24.56.178.140 offset -0.117018 sec root@cubie:~ # ntpdate time.nist.gov 21 Sep 13:05:00 ntpdate[2238]: adjust time server 24.56.178.140 offset -0.116026 sec root@cubie:~ # ntpdate time.nist.gov 21 Sep 13:05:08 ntpdate[2241]: adjust time server 24.56.178.140 offset -0.111525 sec root@cubie:~ # ntpdate time.nist.gov 21 Sep 13:05:26 ntpdate[2242]: adjust time server 24.56.178.140 offset -0.103121 sec root@cubie:~ # ntpdate time.nist.gov 21 Sep 13:05:34 ntpdate[2243]: adjust time server 24.56.178.140 offset -0.099055 sec So as you could notice, the offset doesn't change much. > -- Ian -- wbr, Maxim Filimonov che@bein.link
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