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    SubjectRe: CFQ will be the new default IO scheduler - why?
    Date
    Justin Piszcz wrote:
    > On Mon, 24 Jul 2006, Matthias Andree wrote:
    > > On Sun, 23 Jul 2006, Paa Paa wrote:
    > >> The default IO scheduler in 2.6.18 will be CFQ (Complete Fair Queuing)
    > >> instead of AS (Anticipatory Scheduler) as described here:
    > >> http://wiki.kernelnewbies.org/Linux_2_6_18. I tried to find (here, at
    > >> lkml) the discussion about this change with no luck.
    > >
    > > That wiki document nicely shows the advantage of the scheduler, namely
    > > that you have "ionice", which isn't possible for AS or Deadline
    > > Schedulers - this allows the operating system to run processes like
    > > updatedb with "nice I/O", meaning these hold when you're doing other
    > > I/O.
    >
    > Should there be a default scheduler per filesystem? As some filesystems
    > may perform better/worse with one over another?

    It's currently perDevice, and should probably be extended to perMount.

    Thanks!

    --
    Al

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