[plug] Kernel 2.4.32-preX io throughput

[Craig Ringer]

> Running a vmstat 1 in one window I notice that the data movement becomes 
> smoother, more consistent and the sustained rate almost doubles by running
> 
> while true ; sync ; sleep 1 ; echo -n . ; done
> 
> in another window!!
> 
> Is the 2.4 io scheduler really that bad?

Yes, in my experience. I've found it quite poor - in particular when 
reading from one spindle while writing to another. I get huge stalls 
where all read activity stops and all apps that try to do any reads hang 
until the current write "batch" completes.

Craig Ringer

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