Date: Tue, 22 Jan 2013 09:35:39 -0500 From: Adam McDougall <mcdouga9@egr.msu.edu> To: freebsd-stable@freebsd.org Subject: Re: time issues and ZFS Message-ID: <50FEA3BB.3060607@egr.msu.edu> 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 01/22/13 07:27, Julian Stecklina wrote: > Thus spake Daniel Braniss <danny@cs.huji.ac.il>: > >> In the meantime here is some info: >> Intel(R) Xeon(R) CPU E5645: running with no problems >> LAPIC(600) HPET(450) HPET1(440) HPET2(440) HPET3(440) i8254(100) RTC(0) >> >> Intel(R) Xeon(R) CPU X5550: this is the problematic, at least for the moment >> HPET(450) HPET1(440) HPET2(440) HPET3(440) LAPIC(400) i8254(100) RTC(0) > > 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... > > Julian > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" > This may help: "Problem with LAPIC timer is that it stops working when CPU goes to C3 or deeper idle state. These states are not enabled by default, so unless you enabled them explicitly, it is safe to use LAPIC. In any case present 9-STABLE system should prevent you from using unsafe C-state if LAPIC timer is used. From all other perspectives LAPIC is preferable, as it is faster and easier to operate then HPET. Latest CPUs fixed the LAPIC timer problem, so I don't think that switching to it will be pessimistic in foreseeable future. -- Alexander Motin"
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