N-way mirror read speedup in zfsonlinux

[Martin Matuska]

Attached is a FreeBSD version of this patch for testing and comments,
including sysctl tunable:
http://people.freebsd.org/~mm/patches/zfs/vdev_mirror.c.patch

On 2013-07-12 11:21, Martin Matuška wrote:
> Hi everyone,
>
> zfsonlinux has implemented a change in the N-way mirror device selection
> algorithm by selecting the device with the least pending I/O instead of
> random selection. They measured an increased read bandwidth increase
> up to
> 50% and IOPS increase up to 10%.
>
> this might be useful for common ZFS code and we might consider porting
> this
> to illumos and FreeBSD:
> https://github.com/zfsonlinux/zfs/issues/1461
> https://github.com/zfsonlinux/zfs/commit/556011dbec2d10579819078559a77630fc559112
>

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