Messages in this thread | | | Date | Wed, 11 Apr 2001 11:18:09 -0700 | From | "H. Peter Anvin" <> | Subject | Re: announce: PPSkit patch for Linux 2.4.2 (pre6) |
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Alan Cox wrote: > > > appropriately.) One could, at least theoretically, make them usable > > in kernel space only (in user space there is no hope, since you can't > > know which CPU's TSC you're reading), but these machines seem to be so > > rare that hardly anyone technical enough to fix it cares. > > Im working on making the 'notsc' automatic. Trying to 'fix' it is just plain > hard work. With the fixed one however we can still use the tsc for udelay > as we have per cpu loops_per_jiffy data. > > This btw is why -ac figures out the bus multiplier on your processors. If they > dont match then we know tsc wants to be off. Just nobody has written the code > to disable it across all CPUs yet >
Yes, there are two cases where we can "fix" it: in the timer interrupt code, and the loops_per_jiffy stuff.
-hpa
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