Luck, Tony wrote:
I'm guessing here ... I haven't cross-checked with the architects.
I'll be glad if we can get a comment from Intel's architects.
I talked this through with an architect, and I'm right. In the
sequence:
ld4.acq rM = [rN]
;;
mov rP = ar.itc
there are no dependencies, so the read of ar.itc can occur
"IMMEDIATELY after the load issues".
Consuming the result of the load in between will create a
dependency ... so the timestamp will be taken as we want it,
after the load.
So I can apply this patch (moving the "and r28 = ~1,r28").
Thank you for checking it.
What other time patches are you still pushing? The time
interpolator changes that were predicted still look like
they are pending somewhere (kernel/timer.c hasn't been
changed).
-Tony
I don't know the current status of Bob's patches...
I hope you don't mind applying my small patches before Bob's.
Here are 2 pending patches I'm pushing :
- [PATCH] ia64: Scalability improvement of gettimeofday with
jitter compensation
- [PATCH] fsys_gettimeofday leaps days if it runs with nojitter
I confirmed that these 2 can be applied to 2.6.22 (with some offset).
Let me know if you need refreshed ones.
Thanks,
H.Seto
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