I think the problem here is outside afs.
Just doing this dd test but writing data directly to the ext2
target gives same behaviour, i.e. on 2.4 kernel I see most of the
CPU idle but on 2.6 kernel all that CPU amount is shown as in
wait state. And the numbers from 2.4 kernel show higher throughput
compared to the 2.6 kernel (regardless the the PREEMPT or no PREEMPT
was used).
M.
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