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Date: Thu, 27 Mar 2014 14:27:26 -0700 From: John Stultz <john.stultz@...aro.org> To: Andy Lutomirski <luto@...capital.net> Cc: Clemens Ladisch <clemens@...isch.de>, Feng Tang <feng.tang@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86_64 On Thu, Mar 27, 2014 at 12:52 PM, Andy Lutomirski <luto@...capital.net> wrote: > On 03/27/2014 04:02 AM, Clemens Ladisch wrote: >> Feng Tang wrote: >> The help text still says: >> | You can safely choose Y here. [...] >> | Choose N to continue using the legacy 8254 timer. >> >> Are these statements still true for those platforms? > > They aren't true for modern desktop and server platforms -- the TSC is > used regardless of hpet availability. While I suspect the comment above is in relation to the non-apic timer. But with respect to timekeeping, our point is true assuming the TSC isn't mucked up by the BIOS. My 1yr old i7-3930k single socket system still has some wonky BIOS bug that offsets the boot core's TSC. And that's intel's bios, so I can only imagine other vendors have found other ways to cause trouble. So yea, the hpet availability for timekeeping is still important, as the TSC can still be problematic. thanks -john -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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