Annie Li writes:
> Can anyone help explain what does "out-of-order issue" mean in
the
> following segment?
>
> ZFS has a pipelined I/O engine, similar in concept to CPU pipelines. The
> pipeline operates on I/O dependency graphs and provides scoreboarding,
> priority, deadline scheduling, out-of-order issue and I/O aggregation.
> I/O loads that bring other filesystems to their knees
> <http://blogs.sun.com/roller/page/bill?entry=zfs_vs_the_benchmark>
are
> handled with ease by the ZFS I/O pipeline.
>
>
> Thanks,
> Annie
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
As an example, it says that, even if a read was issued by an
application ''after'' ZFS had started to work on a group of
write I/Os, the read could actually issue ahead of some of
the writes.
-r