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    SubjectRe: Kernel SCM saga..
    On Sat, Apr 09, 2005 at 05:47:08PM +1000, Neil Brown wrote:
    > On Saturday April 9, willy@w.ods.org wrote:
    > >
    > > I've just checked, it takes 5.7s to compare 2.4.29{,-hf3} over NFS (13300
    > > files each) and 1.3s once the trees are cached locally. This is without
    > > comparing file contents, just meta-data. And it takes 19.33s to compare
    > > the file's md5 sums once the trees are cached. I don't know if there are
    > > ways to avoid some NFS operations when everything is cached.
    > >
    > > Anyway, the system does not seem much efficient on hard links, it caches
    > > the files twice :-(
    >
    > I suspect you'll be wanting to add a "no_subtree_check" export option
    > on your NFS server...

    Thanks a lot, Neil ! This is very valuable information. I didn't
    understand such implications from the exports(5) man page, but it
    makes a great difference. And the diff sped up from 5.7 to 3.9s
    and from 19.3 to 15.3s.

    Cheers,
    Willy

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