Date: Tue, 22 Jan 2013 08:53:28 -0500 From: Ryan Stone <rysto32@gmail.com> To: Julian Stecklina <jsteckli@os.inf.tu-dresden.de> Cc: freebsd-stable@freebsd.org Subject: Re: time issues and ZFS Message-ID: <CAFMmRNwcvfY1Y_dPhKCxkuV4E20PvgRAV4W2a_iK5-Md_-tfXQ@mail.gmail.com> In-Reply-To: <8738xtwggj.fsf@os.inf.tu-dresden.de> References: <E1TxFcr-0006dx-MX@kabab.cs.huji.ac.il> <1358780588.32417.414.camel@revolution.hippie.lan> <E1TxJP2-000DS8-DJ@kabab.cs.huji.ac.il> <1358783667.32417.434.camel@revolution.hippie.lan> <CAJ-Vmo=2Dmf4Lb-uoUQDrybyRSS=_bnV5KcNYGg5MnMxfhhu7w@mail.gmail.com> <E1TxYHa-0002yo-4Y@kabab.cs.huji.ac.il> <8738xtwggj.fsf@os.inf.tu-dresden.de>
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On Tue, Jan 22, 2013 at 7:27 AM, Julian Stecklina < jsteckli@os.inf.tu-dresden.de> wrote: > Does anyone know why the LAPIC is given a lower priority than HPET in > this case? If you have an LAPIC, it should always be prefered to HPET, > unless something is seriously wrong with it... > On many processors the lapic timer does not work correctly in states lower than C1. There are many processors that will automatically enter a "C1E" mode when the processor is idle, and in that state I have seen the lapic timer run slower than the programmed frequency, causing time to move to slowly on idle FreeBSD systems.
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