In usual workload, the number of dirty pages varies a lot for each
iteration
and we should gain really a lot for relatively clean cases.
Can you post such a test, for an idle large guest?
OK, I'll do!
Result of "low workload test" (running top during migration) first,
4GB guest
picked up slots[1](len=3757047808) only
*****************************************
get.org get.opt switch.opt
1060875 310292 190335
1076754 301295 188600
655504 318284 196029
529769 301471 325
694796 70216 221172
651868 353073 196184
543339 312865 213236
1061938 72785 203090
689527 323901 249519
621364 323881 473
1063671 70703 192958
915903 336318 174008
1046462 332384 782
1037942 72783 190655
680122 318305 243544
688156 314935 193526
558658 265934 190550
652454 372135 196270
660140 68613 352
1101947 378642 186575
... ... ...
*****************************************
As expected we've got the difference more clearly.
In this case, switch.opt reduced 1/3 (.1 msec) compared to get.opt
for each iteration.
And when the slot is cleaner, the ratio is bigger.
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