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    SubjectRe: [RFC][PATCH 0/12] KVM, x86, ppc, asm-generic: moving dirty bitmaps to user space

    >>>
    >>> 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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