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    SubjectRe: [PATCH 06/13] writeback: bdi write bandwidth estimation
    On Wed, 17 Nov 2010 12:27:26 +0800
    Wu Fengguang <fengguang.wu@intel.com> wrote:

    > + w = min(elapsed / (HZ/100), 128UL);

    I did try setting HZ=10 many years ago, and the kernel blew up.

    I do recall hearing of people who set HZ very low, perhaps because
    their huge machines were seeing performance prolems when the timer tick
    went off. Probably there's no need to do that any more.

    But still, we shouldn't hard-wire the (HZ >= 100) assumption if we
    don't absolutely need to, and I don't think it is absolutely needed
    here.


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