Re: [RFC patch 15/15] LTTng timestamp x86

From: H. Peter Anvin
Date: Mon Oct 20 2008 - 18:32:23 EST

Linus Torvalds wrote:

But it's not going to solve the "hey, I have 512 CPU's, they are all on different boards, and no, they are _not_ synchronized to one global clock!".

That's why I'd suggest making _purely_ local time, and then aiming for something NTP-like. But maybe there are better solutions out there.

At the same time, it would definitely be nice to encourage vendors of large SMP systems to provide a common root crystal (frequency standard) for a single SMP domain. Preferrably a really good one, TCXO or better.

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