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    SubjectRe: AMD X2 unsynced TSC fix?
    Date
    On Friday 27 October 2006 23:46, Andrew Morton wrote:
    > On Fri, 27 Oct 2006 23:35:24 -0700
    >
    > thockin@hockin.org wrote:
    > > On Fri, Oct 27, 2006 at 09:06:12PM -0700, Andi Kleen wrote:
    > > > > So far, has I can understand. Seems to me that my computer which have
    > > > > a Pentium D (Dual Core) on VIA chipset, also have unsynchronized TSC
    > > > > and with the patch of hrtimers on
    > > >
    > > > Intel systems (except for some large highend systems) have synchronized
    > > > TSCs.
    > >
    > > Does Intel guarantee that, or is that just what we happen to see, so far.
    >
    > Matthias has a Xeon machine on which the TSCs are unsynced, and which are
    > unsyncable - write_tsc() just doesn't do anything. See thread at
    > http://lkml.org/lkml/2006/7/22/104

    That is a clear BIOS bug (FSBs are programmed incorrectly) and doesn't seem to
    be common. In fact the BIOS bug is so bad that it's surprising the system
    works at all.

    -Andi
    -
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