Re: raid5-cache I/O path improvements V2

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On Tue, Sep 15, 2015 at 02:54:59PM -0700, Shaohua Li wrote:
> > I don't want a sysfs config if we can possibly avoid it.
> > 
> > Christoph's code sets FUA on every block written to the log, both data
> > and metadata.  Is that really what we want?
> > 
> > I don't know much of the hardware details, but wouldn't setting FUA and
> > FLUSH on the last block written be just as effective and possibly faster
> > (by giving more flexibility to lower layers)??
> 
> How is it different against without FUA, eg, doing a flush after several bios?

It's just a more complicated version of doing the same..
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