gentoo linux, kernel 3.10.31 mount options bug?

[Marko Weber|8000]

Thanks for the short and clear answer stan.

Marko

On 23. Februar 2014 23:10:43 MEZ, Stan Hoeppner <stan at hardwarefreak.com> wrote:
>On 2/23/2014 3:37 AM, Marko Weber|8000 wrote:
>...
>> linux /bzImage-3.10.31 root=/dev/md2 elevator=cfq clocksource=hpet
>                                       ^^^^^^^^^^^^
>
>cfq tends to defeat much of the parallelism in XFS, decreasing
>throughput substantially.  This is documented in the XFS FAQ and has
>been discussed here many times in the past.  It has been recommended
>for
>a few years now that XFS not be used with the cfq elevator.  Use
>deadline with md arrays on plain HBAs and noop on SSDs or any device
>with [F|B]BWC, i.e. RAID HBA or SAN controller.
>
>If you're using cfq to allow shaping of per process IO with control
>groups, simply using cfq alone may slow down XFS throughput to the
>point
>that you don't need to bother with control group optimizations.
>
>-- 
>Stan

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