Date: Thu, 20 Jun 2013 16:45:49 -0700 From: Adrian Chadd <adrian@freebsd.org> To: freebsd-mobile@freebsd.org, freebsd-current <freebsd-current@freebsd.org>, Alexander Motin <mav@freebsd.org> Subject: Atom N450 + C3 + HPET == bad timer behaviour Message-ID: <CAJ-VmonRcBBX-=wr0wpAVJQJCztYSDxj1fUoCXhL99OkAWrqXg@mail.gmail.com>
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Hi, I'm having issues with HPET + C3 state on this Atom N450 based netbook. This is (shocking, I know!) running -HEAD (r251605.) If I use C2, HPET is fine. If I use RTC, i8254, LAPIC, C3 is also fine. But C3 + HPET results in multi-second pauses where it should be 1 second. I've disabled powerd and verified that dev.cpu.0.freq=1667; so it's not CPU frequency related. Doug found this: apparently SMI + timer fondling doesn't quite work out? http://lkml.indiana.edu/hypermail/linux/kernel/1102.3/00842.html Thanks! adrian
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