[lkml]   [2009]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [RESEND] [PATCH] readahead:add blk_run_backing_dev

    Wu Fengguang, on 06/29/2009 06:51 PM wrote:
    > On Mon, Jun 29, 2009 at 10:43:48PM +0800, Ronald Moesbergen wrote:
    >> 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
    > OK, thanks for the tests anyway!
    >> serverside and openiscsi on the client. I get much better throughput
    >> (90 MB/s) when using the patches supplied with SCST, together with the
    > What do you mean by "patches supplied with SCST"?

    Ronald means io_context patch
    which allows SCST's I/O threads to share a single IO context.


     \ /
      Last update: 2009-06-29 17:41    [W:0.024 / U:0.104 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site