Re: gettimeofday non-monotonic on SMP 2.3.47

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Mon Feb 28 2000 - 07:42:08 EST


> Who ever told you that Linux is MP Spec 1.4 compliant?

Actually its impossible to be entirely compliant because the spec is too
vague.

> I imagine that having to manage non-synced TSCs would be a *big*
> performance hit. It would be better to just panic at boot on such an
> oddball config.

All the x86 cpu SMP machines have synchronized busses so the TSC rate is
the same (so far anyway) but the TSC start on a few machines varies. 2.2.15pre
is quite happy on such a board but the code hasnt been rewritten for 2.3.x
as far as I know.

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