Hi all, This is a set of patch for ia64 clocksource to improve performance of fsys_gettimeofday (and also normal gettimeofday). [1/3] copy time structures into fsys_gtod_data [2/3] separate data for jitter compensation [3/3] remove cmpxchg loop in gettimeofday Finally, the results of my test at start: > # clocksource (Bob's) : default > CPU 0: 4.66 (usecs) (0 errors / 2145680 iterations) > CPU 1: 4.65 (usecs) (493 errors / 2148438 iterations) > CPU 2: 4.63 (usecs) (668 errors / 2159461 iterations) > CPU 3: 4.62 (usecs) (654 errors / 2163997 iterations) > # clocksource (Bob's) : nojitter > CPU 0: 0.14 (usecs) (0 errors / 70945550 iterations) > CPU 1: 0.14 (usecs) (470 errors / 71640889 iterations) > CPU 2: 0.14 (usecs) (664 errors / 70960917 iterations) > CPU 3: 0.14 (usecs) (571 errors / 70956121 iterations) > # clocksource (Bob's) : nolwsys > CPU 0: 2.88 (usecs) (0 errors / 3475147 iterations) > CPU 1: 2.88 (usecs) (0 errors / 3474881 iterations) > CPU 2: 2.96 (usecs) (0 errors / 3382229 iterations) > CPU 3: 2.97 (usecs) (0 errors / 3371004 iterations) are now refined to: > # clocksource (fixed) : default > CPU 0: 1.33 (usecs) (0 errors / 7507837 iterations) > CPU 1: 1.31 (usecs) (0 errors / 7621659 iterations) > CPU 2: 1.27 (usecs) (0 errors / 7865412 iterations) > CPU 3: 1.27 (usecs) (0 errors / 7863362 iterations) > # clocksource (fixed) : nojitter > CPU 0: 0.14 (usecs) (0 errors / 69608888 iterations) > CPU 1: 0.14 (usecs) (0 errors / 70277433 iterations) > CPU 2: 0.14 (usecs) (0 errors / 69632925 iterations) > CPU 3: 0.14 (usecs) (0 errors / 69606531 iterations) > # clocksource (fixed) : nolwsys > CPU 0: 1.48 (usecs) (0 errors / 6770870 iterations) > CPU 1: 1.48 (usecs) (0 errors / 6777897 iterations) > CPU 2: 1.49 (usecs) (0 errors / 6728101 iterations) > CPU 3: 1.49 (usecs) (0 errors / 6703961 iterations) Thanks, H.Seto - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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