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    SubjectRe: NFS client latencies
    On Wed, 2005-03-30 at 16:14 -0500, Trond Myklebust wrote:
    > on den 30.03.2005 Klokka 11:56 (-0800) skreiv Andrew Morton:
    > > > That's normal and cannot be avoided: when writing, we have to look for
    > > > the existence of old nfs_page requests. The reason is that if one does
    > > > exist, we must either coalesce our new dirty area into it or if we
    > > > can't, we must flush the old request out to the server.
    > >
    > > One could use the radix-tree tagging stuff so that the gang lookup only
    > > looks up pages which are !NFS_WBACK_BUSY.
    > Yes. Together with the radix tree-based sorting of dirty requests,
    > that's pretty much what I've spent most of today doing. Lee, could you
    > see how the attached combined patch changes your latency numbers?

    Different code path, and the latency is worse. See the attached ~7ms

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