Date: Tue, 10 Sep 2019 08:44:07 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Neel Chauhan <neel@neelc.org> Cc: freebsd-current@freebsd.org Subject: Re: TSC-low clock slow on WhiskeyLake i7-8565U (HP Spectre x360 13-ap0043dx) Message-ID: <20190910054407.GW2559@kib.kiev.ua> In-Reply-To: <72978644df330013de27c75e6285ab4d@neelc.org> References: <72978644df330013de27c75e6285ab4d@neelc.org>
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On Mon, Sep 09, 2019 at 04:07:39PM -0400, Neel Chauhan wrote: > Hi, > > I recently got a HP Spectre x360 13-ap0043dx as a gift and by default > the clock runs slower on FreeBSD than Windows or Linux. Yes, I know the > ThinkPad is the best laptop for FreeBSD, but getting an X1 Carbon would > increase the price of the gift even more which couldn't be done. > > The kern.timecounter.hardware by default is set to TSC-low and the clock > is slow on the Spectre x360. Setting it to ACPI-slow resolves this > issue. > > The CPU is a Intel WhiskeyLake Core i7-8565U. > > Is the slow TSC-low an issue with WhiskeyLake in general or specifically > HP? Is it something else? > > I am considering writing a patch but before I write one, do other people > with WhiskeyLake laptops (or newer) have slow clocks (where one second > on the system is actually more in real life), or not. Start with providing full listing dmesg for verbose boot. Out of blue, try to set machdep.disable_tsc_calibration=1 in loader.conf and see if this improves things.
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