On Tue, Jun 19, 2018 at 10:57:35PM +0200, Thomas Gleixner wrote:
> I'm not arguing against removing it. I just refuse to accept changelogs
> which suggest that there is no functional change.
Fair enough..
On Tue, 19 Jun 2018, Peter Zijlstra wrote:
> On Tue, Jun 19, 2018 at 09:12:45PM +0200, Thomas Gleixner wrote:
> > On Tue, 19 Jun 2018, Peter Zijlstra wrote:
> > > It does not; there is TSC usage even if you boot with notsc on. See how
> > > it does not clear X86_FEATURE_TSC for instance.
> >
> >
On Tue, Jun 19, 2018 at 09:12:45PM +0200, Thomas Gleixner wrote:
> On Tue, 19 Jun 2018, Peter Zijlstra wrote:
> > It does not; there is TSC usage even if you boot with notsc on. See how
> > it does not clear X86_FEATURE_TSC for instance.
>
> Well, kinda. There is some stuff in the apic calibration
On Tue, 19 Jun 2018, Peter Zijlstra wrote:
> On Tue, Jun 19, 2018 at 07:32:49PM +0200, Thomas Gleixner wrote:
> > On Fri, 15 Jun 2018, Pavel Tatashin wrote:
> >
> > > tsc_disabled is set when notsc is passed as kernel parameter. The reason
> > > we
> > > have notsc is to avoid timing problems on
On Tue, Jun 19, 2018 at 07:32:49PM +0200, Thomas Gleixner wrote:
> On Fri, 15 Jun 2018, Pavel Tatashin wrote:
>
> > tsc_disabled is set when notsc is passed as kernel parameter. The reason we
> > have notsc is to avoid timing problems on multi-socket systems. We already
> > have a mechanism, howe
> > tsc_disabled is set when notsc is passed as kernel parameter. The reason we
> > have notsc is to avoid timing problems on multi-socket systems. We already
> > have a mechanism, however, to detect and resolve these issues by invoking
> > tsc unstable path. Thus, make notsc to behave the same as
On Fri, 15 Jun 2018, Pavel Tatashin wrote:
> tsc_disabled is set when notsc is passed as kernel parameter. The reason we
> have notsc is to avoid timing problems on multi-socket systems. We already
> have a mechanism, however, to detect and resolve these issues by invoking
> tsc unstable path. Th
tsc_disabled is set when notsc is passed as kernel parameter. The reason we
have notsc is to avoid timing problems on multi-socket systems. We already
have a mechanism, however, to detect and resolve these issues by invoking
tsc unstable path. Thus, make notsc to behave the same as tsc=unstable.
tsc_disabled is set when notsc is passed as kernel parameter. The reason we
have notsc is to avoid timing problems on multi-socket systems. We already
have a mechanism, however, to detect and resolve these issues by invoking
tsc unstable path. Thus, make notsc to behave the same as tsc=unstable.
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