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    SubjectRe: [RESEND] [PATCH] readahead:add blk_run_backing_dev
    2009/6/29 Wu Fengguang <>:
    > On Mon, Jun 29, 2009 at 09:13:27PM +0800, Wu Fengguang wrote:
    >> On Mon, Jun 29, 2009 at 09:04:57PM +0800, Vladislav Bolkhovitin wrote:
    >> > Wu Fengguang, on 06/29/2009 04:54 PM wrote:
    >> > >
    >> > > Why not 2.6.30? :)
    >> >
    >> > We started with 2.6.29, so why not complete with it (to save additional
    >> > Ronald's effort to move on 2.6.30)?
    >> OK, that's fair enough.
    > btw, I backported the 2.6.31 context readahead patches to 2.6.29, just
    > in case it will help the SCST performance.
    > Ronald, if you run context readahead, please make sure that the server
    > side readahead size is bigger than the client side readahead size.

    I tried this patch on a vanilla kernel and no other patches applied,
    but it does not seem to help. The iSCSI throughput does not go above
    60MB/s. (1GB in 17 seconds). I have tried several readahead settings
    from 128KB up to 4MB and kept the server readahead at twice the client
    readahead, but it never comes above 60MB/s. This is using SCST on the
    serverside and openiscsi on the client. I get much better throughput
    (90 MB/s) when using the patches supplied with SCST, together with the
    blk_run_backing_dev readahead patch.


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