Date: Mon, 11 Jun 2007 16:53:36 +0400 (MSD) From: Dmitry Morozovsky <marck@rinet.ru> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@fer.hr> Subject: Re: calcru: runtime went backwards, RELENG_6, SMP Message-ID: <20070611164121.J20351@woozle.rinet.ru> In-Reply-To: <200706091957.l59JvDWR026822@apollo.backplane.com> References: <20070606153542.Y76617@woozle.rinet.ru> <f46tmc$rgb$2@sea.gmane.org> <20070606231940.T91939@woozle.rinet.ru> <200706062127.l56LRYTe090137@apollo.backplane.com> <20070608111809.U97287@woozle.rinet.ru> <200706090809.l5989Mkj020033@apollo.backplane.com> <20070609163329.P4850@woozle.rinet.ru> <200706091957.l59JvDWR026822@apollo.backplane.com>
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On Sat, 9 Jun 2007, Matthew Dillon wrote:
MD> :Well, I can of course shut the kernel up, but kernel time stability is still my
MD> :concern. I run ntpd there and while sometimes it seems stable (well, sorta:
MD> :drift are within several seconds...) there are cases of half-a-minute time
MD> :steps.
MD>
MD> If you don't want to do that, try forcing the timer to use the 8254
MD> and see if that helps. You may also have to reduce the system tick
MD> to ~100-200 hz.
Does not help either:
ct-new# sysctl kern.clockrate
kern.clockrate: { hz = 200, tick = 5000, profhz = 133, stathz = 26 }
ct-new# sysctl kern.timecounter
kern.timecounter.tick: 1
kern.timecounter.choice: TSC(-100) ACPI-safe(1000) i8254(0) dummy(-1000000)
kern.timecounter.hardware: i8254
kern.timecounter.nsetclock: 3
kern.timecounter.ngetmicrotime: 6118
kern.timecounter.ngetnanotime: 0
kern.timecounter.ngetbintime: 0
kern.timecounter.ngetmicrouptime: 4741
kern.timecounter.ngetnanouptime: 30
kern.timecounter.ngetbinuptime: 485
kern.timecounter.nmicrotime: 1027
kern.timecounter.nnanotime: 96
kern.timecounter.nbintime: 1123
kern.timecounter.nmicrouptime: 804
kern.timecounter.nnanouptime: 0
kern.timecounter.nbinuptime: 60658
kern.timecounter.stepwarnings: 0
kern.timecounter.smp_tsc: 0
ct-new# ps
calcru: negative runtime of -1322717 usec for pid 4 (g_down)
calcru: negative runtime of -1322717 usec for pid 4 (g_down)
PID TT STAT TIME COMMAND
Sincerely,
D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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