> I doubt it, first come-first go is most common. The
> same holds for
> memory as well.
> Regards,
> Andrey

and that is because it was considered and rejected because of XYZ reaons (or 
lack of sufficient reasons) or simply something thats not been evaluated. I 
would argue the following problem is a side effect of not having fair I/O 
scheduling.
http://opensolaris.org/jive/thread.jspa?threadID=121374&tstart=0

But again I find it hard to believe no read  preemption takes place. What 
happens while executing a read you memory fault and need to issue other reads 
clearly these new reads initiated by OS cannot be ordered.
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