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Date: Sat, 8 Dec 2018 16:44:55 +0300
From: Lev Serebryakov <lev@FreeBSD.org>
Reply-To: Lev Serebryakov <lev@FreeBSD.org>
Organization: FreeBSD
Message-ID: <1794522781.20181208164455@serebryakov.spb.ru>
To: Eugene Grosbein <eugen@grosbein.net>, freebsd-hackers@freebsd.org, 
 freebsd-current@freebsd.org
Subject: Re: Painfully slow compilation (read: "make buildworld buildkernel")
 on not-so-weak system
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References: <902729965.20181208141303@serebryakov.spb.ru>
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Hello Eugene,

Saturday, December 8, 2018, 4:27:13 PM, you wrote:

>>  I'm completely lost. Is it problem of software? Hardware? If it is
>> hardware problem what should I blame?

> Try using different kern.timecounter.hardware and/or kern.eventtimer.timer
> but first try kern.eventtimer.periodic=1 instead of default 0.
 Nothing helps. I've tried periodic=1 and replace hardware and time with HPT
 (from TSC-Low and LAPIC), but system still "sticky" with single-job build
 and unresposnive with multiple-job build, and still there is strange bursts
 of CPU consumption from threads and processes which should be low-profile.

> If something of this helps, try going back to defaults and then disable power-saving settings, if any.
 I'll try to disable C2/C3 and turn off Turbo as next step...

-- 
Best regards,
 Lev                            mailto:lev@FreeBSD.org