Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [patch 4/9] Remove the TSC synchronization on SMP machines | Date | Fri, 2 Feb 2007 08:13:27 +0100 |
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On Thursday 01 February 2007 14:17, Jiri Bohac wrote: > On Thu, Feb 01, 2007 at 12:14:23PM +0100, Andi Kleen wrote: > > On Thursday 01 February 2007 10:59, jbohac@suse.cz wrote: > > > TSC is either synchronized by design or not reliable > > > to be used for anything, let alone timekeeping. > > > > In my tree this is already done better by a patch from Ingo. > > Check if they look synchronized and don't use TSC if they are not. > > The whole purpose of this patchset is to make use of TSC even if > it's not synchronized.
It's still useful as a double check for platforms (like Intel single node) which are supposed to be synchronized.
> Synchronizing it will not make anything better in any way -- the > implementation just does not care whether TSCs are synchronized. > That's why I think the synchronization code is not needed.
It doesn't actively synchronize it, just checks if they look synchronized.
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