linux-kernel - Re: [GIT pull] x86/timers for 4.10

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Message-ID: <alpine.DEB.2.20.1702091620270.3604@nanos>
Date:   Thu, 9 Feb 2017 16:21:13 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Mike Galbraith <efault@....de>
cc:     Olof Johansson <olof@...om.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [GIT pull] x86/timers for 4.10

On Thu, 9 Feb 2017, Mike Galbraith wrote:

> On Thu, 2017-02-09 at 16:07 +0100, Thomas Gleixner wrote:
> > On Wed, 8 Feb 2017, Mike Galbraith wrote:
> > > On Wed, 2017-02-08 at 12:44 +0100, Thomas Gleixner wrote:
> > > > On Mon, 6 Feb 2017, Olof Johansson wrote:
> > > > > [    0.177102] [Firmware Bug]: TSC ADJUST differs: Reference CPU0:
> > > > > -6495898515190607 CPU1: -6495898517158354
> > > > 
> > > > Yay, another "clever" BIOS ....
> > > 
> > > Oh yeah, that reminds me...
> > > 
> > > I met one such box, and the adjustment code did salvage it, but I had
> > > to cheat a little for it to do so reliably, as it would sometimes still
> > > see a delta of 1 or 2 whole cycles, and hand me a useless wreck instead
> > > quick like bunny big box.
> > 
> > Can you share your cheatery ?
> 
> I didn't keep it, it was just a bandaid for a fleeting use, dirt simple
> ignore microscopic delta.

Can you send me the dmesg output of that box for a good and a bad case or
don't you have access to it anymore?

Thanks,

	tglx