[lkml]   [2012]   [Apr]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH v2 07/16] KVM: MMU: introduce for_each_pte_list_spte
    On Mon, 16 Apr 2012 11:36:25 +0800
    Xiao Guangrong <> wrote:

    > I tested it with kernbench, no regression is found.

    Because kernbench is not at all good test for this.

    > It is not a problem since the iter and spte should be in the cache.

    I have checked dirty-log-perf myself with this patch [01-07].

    GET_DIRTY_LOG for 1GB dirty pages has become more than 15% slower.

    This is not a pure cleanup and introduces significant regression to
    rmap handling.

    This is the reason why I asked to remove "cleanup patches" from this
    patch series. Had it been really trivial cleanup, I would not have
    asked that.

    Note: if you had checked the worst case latency with this patch series,
    you should have noticed this regression by yourself.

    Auto-test and kernbench are not enough to see the effect of this work.


     \ /
      Last update: 2012-04-17 16:51    [W:0.022 / U:8.652 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site