Date: Mon, 26 Nov 2018 14:14:03 +0100 From: Gerrit =?ISO-8859-1?Q?K=FChn?= <gerrit.kuehn@aei.mpg.de> To: freebsd-stable@freebsd.org Subject: Re: high cpu irq load and slow boot after update from 10.4 to 11.2 Message-ID: <20181126141403.71ff15eb77e55b5e9ce4f79b@aei.mpg.de> In-Reply-To: <007b9007-6abb-15cf-45df-45b3da814e5d@grosbein.net> References: <20181126094648.510fc7f7b773bfdac546d037@aei.mpg.de> <007b9007-6abb-15cf-45df-45b3da814e5d@grosbein.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, 26 Nov 2018 19:34:43 +0700 Eugene Grosbein <eugen@grosbein.net> wrote about Re: high cpu irq load and slow boot after update from 10.4 to 11.2: > > Any ideas? > Maybe this box has some clocking problems incompatible with tickless > kernel. Is there anything I could look out for in dmesg or similar to spot the root cause for this behaviour? The CPUs are Xeon E5606 on a Supermicro X8DTU mainboard. > Try get back to old periodic ticking with sysctl > kern.eventtimer.periodic=1 instead of now default 0. I'll try that as soon as I spot the issue again. > Of, if you are curious, run ntpd if it is not already running, wait > about an hour then look to its /var/db/ntpd.drift file to see if system > clock is good or not. ntpd is always running. Right now it looks ok to me (but the issue is not there, either). root@storage:~ # cat /var/db/ntpd.drift -1.366 > Perhaps, you can get better behaviour changing default value > of kern.timecounter.hardware to another one from kern.timecounter.choice; > same with kern.eventtimer.timer and kern.eventtimer.choice Would that work while I see the issue (i.e., should it make the issue go away then), or should this be set on (re)boot? Which settings would be recommended to try? This is what I have now: --- root@storage:~ # sysctl kern.timecounter.hardware kern.timecounter.hardware: TSC root@storage:~ # sysctl kern.timecounter.choice kern.timecounter.choice: ACPI-safe(850) HPET(950) i8254(0) TSC(1000) dummy(-1000000) root@storage:~ # sysctl kern.eventtimer.timer kern.eventtimer.timer: LAPIC root@storage:~ # sysctl kern.eventtimer.choice kern.eventtimer.choice: LAPIC(600) HPET(350) HPET1(340) HPET2(340) HPET3(340) i8254(100) RTC(0) --- Thanks for your input. cu Gerrit
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20181126141403.71ff15eb77e55b5e9ce4f79b>