Date: Wed, 03 Jun 2020 14:40:07 -0600 From: Ian Lepore <ian@freebsd.org> To: Gordon Bergling <gbergling@googlemail.com>, freebsd-hackers@freebsd.org Cc: Allan Jude <allanjude@freebsd.org> Subject: Re: Constant load of 1 on a recent 12-STABLE Message-ID: <ea3ebab2a0aefde8693097ac964917affa696917.camel@freebsd.org> In-Reply-To: <20200603202929.GA65032@lion.0xfce3.net> References: <20200603101607.GA80381@lion.0xfce3.net> <c18664e8-b4e3-1402-48ed-3a02dc36ce29@freebsd.org> <20200603202929.GA65032@lion.0xfce3.net>
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On Wed, 2020-06-03 at 22:29 +0200, Gordon Bergling via freebsd-hackers wrote: > [...] > > The only key performance indicator that is relatively high IMHO, for a > non-busy system, are the context switches, that vmstat has reported. > > ------------------------------------------------------------------------------- > procs memory page disks faults cpu > r b w avm fre flt re pi po fr sr da0 da1 in sy cs us sy id > 0 0 0 514G 444M 7877 2 7 0 9595 171 0 0 0 4347 43322 17 2 81 > 0 0 0 514G 444M 1 0 0 0 0 44 0 0 0 121 40876 0 0 100 > 0 0 0 514G 444M 0 0 0 0 0 40 0 0 0 133 42520 0 0 100 > 0 0 0 514G 444M 0 0 0 0 0 40 0 0 0 120 43830 0 0 100 > 0 0 0 514G 444M 0 0 0 0 0 40 0 0 0 132 42917 0 0 100 > -------------------------------------------------------------------------------- > > Any other ideas what could generate that load? > > Best regards, > > Interrupts/second consistently zero is the strange part of that vmstat output. That makes me think the problem has something to do with timekeeping and is a problem with the statistics used by top rather than having some "stuck process" actually consuming time. Are there any other signs of timekeeping trouble on the machine, like ntpd repeatedly stepping the clock? What's the output for sysctl kern.timecounter sysctl kern.eventtimer -- Ian
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