On Wed, Sep 1, 2010 at 2:16 PM, Alexander Motin <mav_at_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 [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 Ian -- Ian FreislichReceived on Thu Sep 02 2010 - 07:35:14 UTC
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