Re: [PATCH v13 0/3] scsi: ufs: Add Host Performance Booster Support

[Greg KH]

On Mon, Dec 07, 2020 at 06:26:03PM +0000, Christoph Hellwig wrote:
> On Mon, Dec 07, 2020 at 07:23:12PM +0100, Greg KH wrote:
> > What "real workload" test can be run on this to help show if it is
> > useful or not?  These vendors seem to think it helps for some reason,
> > otherwise they wouldn't have added it to their silicon :)
> > 
> > Should they run fio?  If so, any hints on a config that would be good to
> > show any performance increases?
> 
> A real actual workload that matters.  Then again that was Martins
> request to even justify it.  I don't think the broken addressing that
> breaks a whole in the SCSI addressing has absolutely not business being
> supported in Linux ever.  The vendors should have thought about the
> design before committing transistors to something that fundamentally
> does not make sense.

So "time to boot an android system with this enabled and disabled" would
be a valid workload, right?  I'm guessing that's what the vendors here
actually care about, otherwise there is no real stress-test on a UFS
system that I know of.

thanks,

greg k-h