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    SubjectRe: [PATCH 00/45] some writeback experiments
    On Wed, Oct 07, 2009 at 10:26:32PM +0800, Theodore Ts'o wrote:
    > On Wed, Oct 07, 2009 at 03:38:18PM +0800, Wu Fengguang wrote:
    > >
    > > The estimated writeback bandwidth is about 1/2 the real throughput
    > > for ext2/3/4 and btrfs; noticeable bigger than real throughput for NFS; and
    > > cannot be estimated at all for XFS. Very interesting..
    >
    > Can you expand on what you mean here? Estimated write bandwidth of
    > what? And what are you comparing it against?

    Please refer to [PATCH 21/45] writeback: estimate bdi write bandwidth
    and patch 22, I have some numbers there :)

    > I'm having trouble understanding your note (which I'm guessing you
    > write fairly late at night? :-)

    Sorry - I wrote that when I got tired on debugging ;)

    Thanks,
    Fengguang



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