Re: ext2/3 performance regression in 2.6 vs 2.4 for small interl

[Jamie Lokier]

Helge Hafting wrote:
> Something similiar could be done for io niceness.  If we run out of
> normal priority io, how about not issuing the low priority io
> right away.  Anticipate there will be more high-priority io
> and wait for some idle time before letting low-priority
> requests through.  And of course some maximum wait to prevent
> total starvation.

The problem is quite similar to scheduling for quality on a network
device.  Once a packet has started going it, usually you cannot abort
the packet for a higher priority one.

I thought there was a CBQ I/O scheduling patch or such to offer some
kind of I/O niceness these days?

-- Jamie
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