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    SubjectRe: [RFC][Resend] Make NFS-Client readahead tunable
    ----- Original Message ----

    > From: Andrew Morton <akpm@linux-foundation.org>
    > To: Greg Banks <gnb@melbourne.sgi.com>
    > Cc: Martin Knoblauch <knobi@knobisoft.de>; linux-nfs list <linux-nfs@vger.kernel.org>; linux-kernel@vger.kernel.org
    > Sent: Thursday, September 18, 2008 5:13:34 AM
    > Subject: Re: [RFC][Resend] Make NFS-Client readahead tunable
    >
    > On Thu, 18 Sep 2008 11:42:54 +1000 Greg Banks wrote:
    >
    > > I think having a tunable for client readahead is an excellent idea,
    > > although not to solve your particular problem. The SLES10 kernel has a
    > > patch which does precisely that, perhaps Neil could post it.
    > >
    > > I don't think there's a lot of point having both a module parameter and
    > > a sysctl.
    >
    > mount -o remount,readahead=42

    [root@lpsdm52 ~]# mount -o remount,readahead=42 /net/spsdms/fs13
    Bad nfs mount parameter: readahead
    [root@lpsdm52 ~]# mount -o readahead=42 /net/spsdms/fs13
    Bad nfs mount parameter: readahead


    I assume the reply was meant to say that the correct way of introducing a modifyable readahead size is to implement it as a mount option ? :-) I considered it, but it seems to be more intrusive than the workaround patch. It also needs changes to userspace tools - correct?

    Cheers
    Martin



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