Date: Thu, 02 Sep 2010 13:20:29 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Ian FREISLICH <ianf@clue.co.za> Cc: Brandon Gooch <jamesbrandongooch@gmail.com>, FreeBSD-Current <freebsd-current@freebsd.org> Subject: Re: One-shot-oriented event timers management Message-ID: <4C7F7A6D.4070207@FreeBSD.org> In-Reply-To: <E1Or5xj-0000Oo-Nh@clue.co.za> References: <AANLkTikL8Bwg=eX-eUX50VThVkYJ-H_Bz1dB6geKHPYy@mail.gmail.com> <4C7A5C28.1090904@FreeBSD.org> <20100830110932.23425932@ernst.jennejohn.org> <4C7B82EA.2040104@FreeBSD.org> <20100830121148.11926306@ernst.jennejohn.org> <20100831102918.4f5404cc@ernst.jennejohn.org> <4C7CC1DE.1080907@FreeBSD.org> <4C7E2E8A.3030709@FreeBSD.org> <AANLkTikcHn-SXk7Rx6NcSQKtBh-Df-g2pzeU%2BzHor9Vy@mail.gmail.com> <4C7EA696.3030901@FreeBSD.org> <E1Or5xj-0000Oo-Nh@clue.co.za>
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Ian FREISLICH wrote: > On Wed, Sep 1, 2010 at 2:16 PM, Alexander Motin <mav@freebsd.org> wrote: >> Brandon Gooch wrote: >>> This latest patch causes an interrupt storm with the HPET timer on my >>> system. The machine took about 8 minutes to boot and bring me to a >>> login prompt. System interactivity (i.e. input from keyboard, output >>> on console) was fine, but after checking the output of `systat vmstat >>> -1`, I saw the interrupt rate on each HPET entry was over 120k! >>> >>> Can I provide any useful detail? Of course, test patches are always welcom > e :) >> I was able to reproduce alike storm in some situations. >> >> Try new version: http://people.freebsd.org/~mav/timers_oneshot7.patch > > Interrupt rates are definitely reduced. > > [mini] /usr/home/ianf $ vmstat -i > interrupt total rate > irq1: atkbd0 1154 1 > irq9: acpi0 10829 15 > irq16: ath0 uhci3+ 16226 23 > irq18: uhci2 16 0 > irq19: uhci1+ 7090 10 > irq20: hpet0 169288 240 > irq23: uhci0 ehci0 64 0 > irq256: hdac0 187 0 > Total 204854 291 Nice. But 240 still quite a lot. Have you applied tm6292_idle.patch and was this system idle at the moment? > [mini] /usr/home/ianf $ sysctl dev.cpu |grep usage > dev.cpu.0.cx_usage: 0.00% 0.04% 0.80% 99.15% last 1601us > dev.cpu.1.cx_usage: 0.00% 0.00% 0.65% 99.34% last 2078us It is the first time I see in practice system reporting 4 different ACPI C-states. What is this system? What CPU is there? Could you show me full `sysctl dev.cpu` output? -- Alexander Motin
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