Messages in this thread | | | Date | Fri, 27 Oct 2006 22:18:20 +0200 | From | Luca Tettamanti <> | Subject | Re: AMD X2 unsynced TSC fix? |
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Lee Revell <rlrevell@joe-job.com> ha scritto: > Someone recently pointed out to me that a Windows "CPU driver update" > supplied by AMD fixes the unsynced TSC problem on dual core AMD64 > systems. [...] > other incorrect timing effects that these applications may experience on > dual-core processor systems, by periodically adjusting the core > time-stamp-counters, so that they are synchronized." > > What are the chances of Linux getting a similar fix?
Zero? ;) There's always a window where the TSCs are not in sync (and userspace may see a non-monotonic counter); furthermore when C'n'Q is active TSCs aren't updated at a fixed frequency, userspace cannot use TSC for timing anyway.
Luca -- > While we're on all of this, are we going to change "tained" to some > other less alarmist word? "screwed" -- Alexander Viro - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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