Messages in this thread | | | From | Andi Kleen <> | Subject | Re: AMD X2 unsynced TSC fix? | Date | Sat, 28 Oct 2006 02:45:55 -0700 |
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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.
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