Re: [PATCH v2 0/2] Use SYNCHRONIZE CACHE instead of FUA for UFS devices

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On Thu, Feb 02, 2023 at 02:00:39PM -0800, Bart Van Assche wrote:
> Hi Martin,
> 
> Measurements have shown that UFS devices perform better when using SYNCHRONIZE
> CACHE instead of FUA. Hence this patch series that makes the SCSI core submit
> a SYNCHRONIZE CACHE command instead of setting the FUA bit for UFS
> devices. Please consider this patch series for the next merge window.

NAK.  This is a policy decision that might make sense for current UFS
devices.  If you want to do it use the sysfs files from udev to quirk
it up for them.  But there is nothing inherent in the UFS transport
that speaks against using FUA.

And please lobby your suppliers to either don't claim FUA support or
implement it in a useful way in the future.  Unlikely most of us you
and your employer actually have that power in the market.



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