Re: [PATCH] improved boot time TSC synchronization

From: David Mosberger (davidm@napali.hpl.hp.com)
Date: Thu Jan 16 2003 - 12:54:37 EST


>>>>> On Thu, 16 Jan 2003 11:44:55 -0500, Jim Houston <jim.houston@attbi.com> said:

  Jim> The current TSC synchronization may have an error on the order
  Jim> of 1 microsecond on a quad processor system. Not a big deal
  Jim> but annoying if you are trying to figure out what order things
  Jim> happen based on TSC time stamps.

  Jim> Since the IA64 folk already solved this problem, I did a quick
  Jim> hack based on the itc sync code.

Cool. I'm glad to see the code is proving useful on other architectures.
I was hoping that would be the case.

BTW: The algorithm is documented in Section 8.5.2 of my book (see
http://www.lia64.org/book/). If there is enough interested, I'd be
willing to try to talk the publisher into releasing that section as a
PDF (or perhaps HTML).

        --david
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