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    SubjectRe: [PATCH 00/14] GFS
    On Thu, 2005-08-11 at 14:06 +0800, David Teigland wrote:
    > On Tue, Aug 02, 2005 at 09:45:24AM +0200, Arjan van de Ven wrote:
    > > * + if (create)
    > > + down_write(&ip->i_rw_mutex);
    > > + else
    > > + down_read(&ip->i_rw_mutex);
    > >
    > > why do you use a rwsem and not a regular semaphore? You are aware that
    > > rwsems are far more expensive than regular ones right? How skewed is
    > > the read/write ratio?
    > Rough tests show around 4/1, that high or low?

    that's quite borderline; if it was my code I'd not use a rwsem for that
    ratio (my own rule of thumb, based on not a lot other than gut feeling)
    is a 10/1 ratio at minimum... but it's not so low that it screams for
    removing it. However.... it might well make your code a lot simpler so
    it might still be worth simplifying.

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      Last update: 2005-08-11 09:03    [W:0.019 / U:9.192 seconds]
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